diff --git a/docs/electron-observation.md b/docs/electron-observation.md
index 3413564c09..24eb051627 100644
--- a/docs/electron-observation.md
+++ b/docs/electron-observation.md
@@ -134,13 +134,30 @@ Cleanup uncertainty does not authorize signaling unrelated processes.
 
 Main-process IPC recording keeps original-function removal for `on` and `once`
 registrations and records a fired `once` callback once. Native Node.js owns
-removal order and traversal, including listeners registered by removal observers;
+`once` registration, firing and callable dispatch as well as removal order and
+traversal, including listeners registered by removal observers;
 the hook translates only its own recording wrappers at the removal boundary.
 Wrapper metadata uses weak keys and does not retain removed registrations.
 Wrapper metadata operations, private collection methods and traversal constructors are captured
 before target startup; later replacement of their global bindings does not
 change listener registration or removal.
 
+Native runtimes differ in whether `once` consults callback `.call` or `.apply`.
+The hook observes actual callback entry without imposing another runtime's
+property reads or argument-list representation. Application methods selected by
+native dispatch keep their original receiver and argument-list object; opaque
+methods produce a `custom-call` or `custom-apply` observation gap when callback
+execution cannot be established.
+
+If native wrapper creation or registration-method lookup could expose private
+instrumentation through an application getter, setter or Proxy, registration
+stays native and unwrapped. The `once-metadata` observation gap identifies that
+unobserved registration attempt; it does not prove registration or delivery. The original callback,
+metadata writes and native method receivers are preserved, including when
+registration fails. Later registrations resume normal observation. Non-callable
+`call`/`apply` properties produce failed observation gaps when native dispatch reads
+them; callback entry is not fabricated.
+
 An `on` listener's application-defined `.apply` receives the original argument-list
 object unchanged. Borrowing the exposed method preserves its dynamic receiver.
 Because that method owns argument interpretation and may not
diff --git a/docs/verification/electron-native-once-2026-10-16.json b/docs/verification/electron-native-once-2026-10-16.json
new file mode 100644
index 0000000000..f2cd834ce9
--- /dev/null
+++ b/docs/verification/electron-native-once-2026-10-16.json
@@ -0,0 +1,1930 @@
+{
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+      "tests/boundary/browser/electronActiveHook.test.ts": "0acff0ad34ef1e126dd10696e821316084509c1621898e4057a8ae488a97ea82",
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+      "experiments/analysis-efficiency/joplin-shell-boundary.mjs": "4cacf3a3accff4166f54119d1645eefd86099db0dd5982dfa34f2875a8bd1f47",
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+      "dist/browser/PlaywrightElectronActiveProjection.js": "9732f6422fff971b75a614225d4da69ca401552ce5a650308224ed897ce6f26c",
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+    }
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+        "electron": null,
+        "cases": 39,
+        "baseline_disagreements": 16,
+        "candidate_disagreements": 0
+      },
+      {
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+      "runtime": "/home/yann/yann/rea-electron-native-once-4593-20261016",
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+        "attachment": {
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+          "width": 1075,
+          "height": 666
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+        "image_visible": true,
+        "shell": [
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+            "correlation_id": "capture:4083186:6161",
+            "event": "showItemInFolder",
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+            "direction": null,
+            "sender": null,
+            "receiver": null,
+            "frame": null,
+            "target": null,
+            "argument_shapes": ["string"],
+            "result_shape": null,
+            "process_type": "browser",
+            "source": "electron-active-hook",
+            "capture_method": "api-wrapper",
+            "artifact_path": null,
+            "artifact_sha256": null,
+            "error": true,
+            "kind": "shell-attempt"
+          }
+        ],
+        "page_errors": []
+      },
+      "provider_ok": false,
+      "error": {
+        "tag": "BrowserObservationError",
+        "reason": "cleanup_failed"
+      },
+      "coverage": {
+        "status": "partial_attach",
+        "observed_event_families": [
+          "app-lifecycle",
+          "ipc",
+          "navigation",
+          "process-lifecycle",
+          "protocol",
+          "shell-attempt",
+          "web-contents-lifecycle",
+          "window-lifecycle"
+        ],
+        "unavailable_event_families": [
+          "download",
+          "error",
+          "native-addon",
+          "permission",
+          "popup-attempt",
+          "preload",
+          "preload-configuration",
+          "renderer-ipc",
+          "updater"
+        ],
+        "observed_roles": ["browser", "main", "web_contents", "window"],
+        "pre_capture_activity": "unavailable"
+      },
+      "retention": {
+        "budget_bytes": 16777216,
+        "estimated_retained_bytes": 12209775,
+        "event_serialized_byte_upper_bound": 2914581,
+        "retained": 6191,
+        "dropped": 0,
+        "dropped_event_families": [],
+        "dropped_event_roles": [],
+        "observed_ipc": 2096,
+        "dropped_ipc": 0,
+        "observed_runtime": 4095,
+        "dropped_runtime": 0
+      },
+      "actions": [
+        {
+          "step_id": "settle-after-reveal",
+          "kind": "wait",
+          "window_index": 0,
+          "target": "window:0",
+          "elapsed_ms": 116,
+          "status": "completed",
+          "error": null
+        }
+      ],
+      "deadline_triggered": false,
+      "workflow_status": "partial-or-failed"
+    },
+    "scope": "Unchanged Joplin shipped welcome PNG/reveal through actual menu and bridge; staged source hashes checked. Explicit test argv shim; overall provider cleanup failed. No synthetic app IPC channels.",
+    "baseline_reference": "PR4562 postmerge709b5cbd receipt /tmp/rea-4562-postmerge-identity.json; operation passed, cleanup failed, family observation unverified. Not an equivalent completed-task performance baseline."
+  },
+  "initial_frozen_cohort": {
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+      "source_clean": true,
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+        "log_sha256": "f567604cf30e2f3973b429a61411cd47b72bdc53856613adb267363890f27648",
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+        "cpu_usec": 36326,
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+        "complete_family_observation_verified": true,
+        "abort": null,
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+          "high": 0,
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+          "oom_group_kill": 0
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+        }
+      }
+    },
+    {
+      "label": "native-alias-red",
+      "meaning": "Own candidate lacked once-metadata gap when getter selected native on alias; regression failed before fix",
+      "receipt": {
+        "log_sha256": "30afb70e1f3bec1c46ae8cf1e7299606f1547c5b3742bdbab4a8b9b72248908a",
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+        }
+      }
+    },
+    {
+      "label": "native-alias-green",
+      "meaning": "Once owner now retains its gap across unhooked native registration; regression passes",
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+      }
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+        "log_sha256": "7563128d918f000adccbd991d88f909be5ce2967f06ef93824714c1850a32c26",
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+        }
+      }
+    },
+    {
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+      "meaning": "Newer runtime regression catches registration-through-native-alias then throw with no gap.",
+      "receipt": {
+        "log_sha256": "cda0c1c2171df157e9c5f349c5f76a14bace3dc510520470b61018c1190563a4",
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+        "cpu_usec": 2625842,
+        "peak_cgroup_bytes": 217219072,
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+        "memory_events": {
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+          "high": 0,
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+          "oom": 0,
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+          "oom_group_kill": 0
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+        }
+      }
+    },
+    {
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+      "meaning": "NOT_EXECUTED test:local rejects built boundary projects; corrected to test:focused.",
+      "receipt": {
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+        "payload_exit_code": 1,
+        "cpu_usec": 451205,
+        "peak_cgroup_bytes": 44204032,
+        "complete_family_observation_verified": true,
+        "abort": null,
+        "memory_events": {
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+          "high": 0,
+          "max": 0,
+          "oom": 0,
+          "oom_kill": 0,
+          "oom_group_kill": 0
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+        "scope": "rea-efficiency-c611888e704c475397d189aa19738300.scope",
+        "scope_poststate": "ActiveState=inactive\nSubState=dead",
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+        }
+      }
+    },
+    {
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+      "meaning": "Actual Electron launch failed display initialization: provider launch environment omits XAUTHORITY. Preserved failed launch; fresh trial uses local Xvfb -nolisten tcp -ac, not a production change.",
+      "receipt": {
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+        "complete_family_observation_verified": false,
+        "abort": null,
+        "memory_events": {
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+          "high": 0,
+          "max": 0,
+          "oom": 0,
+          "oom_kill": 0,
+          "oom_group_kill": 0
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+  "limits": [
+    "CPU/peak counters at payload exit with observer alive, not final scope counters. Cgroup peak includes file cache, not just RSS. False complete-family flag means unverified family measurement.",
+    "Serial frozen comparisons use1CPU/8GiB hard/6GiB early/no swap/192tasks. Early failed helper matrices briefly overlapped on the same CPU; they are not performance evidence.",
+    "Warm filesystem/runtime/build caches and fresh private Joplin configuration. No cold-system or warm-repeat speedup claim.",
+    "Billed tokens and agent context costs are unmeasured; no token benefit claim.",
+    "Standard launch#2974 and provider cleanup#4282 remain failed; raw-wrapper mutation#4513 remains unfixed.",
+    "Historical helper versions not all source-frozen; failure logs are preserved and not relabeled as final-source results.",
+    "Regenerable applications, Node binaries, profiles and multi-MB captures are excluded from Git."
+  ],
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+      "summary": {
+        "profile": "/tmp/rea-4593-native-once-20261016-y_540lpi/trials/joplin-final32/profiles/joplin-shell-p2SQVa",
+        "runtime": "/home/yann/yann/rea-electron-native-once-4593-20261016",
+        "staged_hook_sha256": {
+          "electron-active-hook.cjs": "ea47aad9f9f80aaf46d25a8e7689986613e7c6b83d1d3bcf1af010f077397418",
+          "electron-active-hook-boundaries.cjs": "dae5ac52856a30566ec027cb15ddd46c2920c8defdec11512b6c1f189314d45c"
+        },
+        "elapsed_ms": 17056.830471,
+        "launch_transport": "controlled-argv-shim",
+        "probe": {
+          "before_shell_count": 0,
+          "note": "1. Welcome to Joplin!",
+          "attachment": {
+            "src": "joplin-content://note-viewer//home/yann/.config/joplin-desktop/resources//3b19504020d34ef084f94e4632b69a6b.png?t=1792188662625",
+            "alt": "",
+            "width": 1075,
+            "height": 666
+          },
+          "revealed": "Reveal file in folder",
+          "image_visible": true,
+          "shell": [
+            {
+              "sequence": 7188,
+              "correlation_id": "capture:4075547:7188",
+              "event": "showItemInFolder",
+              "phase": "blocked",
+              "channel": null,
+              "direction": null,
+              "sender": null,
+              "receiver": null,
+              "frame": null,
+              "target": null,
+              "argument_shapes": ["string"],
+              "result_shape": null,
+              "process_type": "browser",
+              "source": "electron-active-hook",
+              "capture_method": "api-wrapper",
+              "artifact_path": null,
+              "artifact_sha256": null,
+              "error": true,
+              "kind": "shell-attempt"
+            }
+          ],
+          "page_errors": []
+        },
+        "provider_ok": false,
+        "error": {
+          "tag": "BrowserObservationError",
+          "reason": "cleanup_failed"
+        },
+        "coverage": {
+          "status": "partial_attach",
+          "observed_event_families": [
+            "app-lifecycle",
+            "ipc",
+            "navigation",
+            "process-lifecycle",
+            "protocol",
+            "shell-attempt",
+            "web-contents-lifecycle",
+            "window-lifecycle"
+          ],
+          "unavailable_event_families": [
+            "download",
+            "error",
+            "native-addon",
+            "permission",
+            "popup-attempt",
+            "preload",
+            "preload-configuration",
+            "renderer-ipc",
+            "updater"
+          ],
+          "observed_roles": ["browser", "main", "web_contents", "window"],
+          "pre_capture_activity": "unavailable"
+        },
+        "retention": {
+          "budget_bytes": 16777216,
+          "estimated_retained_bytes": 14359880,
+          "event_serialized_byte_upper_bound": 3427720,
+          "retained": 7274,
+          "dropped": 0,
+          "dropped_event_families": [],
+          "dropped_event_roles": [],
+          "observed_ipc": 2457,
+          "dropped_ipc": 0,
+          "observed_runtime": 4817,
+          "dropped_runtime": 0
+        },
+        "actions": [
+          {
+            "step_id": "settle-after-reveal",
+            "kind": "wait",
+            "window_index": 0,
+            "target": "window:0",
+            "elapsed_ms": 103,
+            "status": "completed",
+            "error": null
+          }
+        ],
+        "deadline_triggered": false,
+        "workflow_status": "partial-or-failed"
+      },
+      "scope": "Unchanged Joplin shipped welcome PNG/reveal through actual menu and bridge; staged source hashes checked. Explicit test argv shim; overall provider cleanup failed. No synthetic app IPC channels.",
+      "baseline_reference": "PR4562 postmerge709b5cbd receipt /tmp/rea-4562-postmerge-identity.json; operation passed, cleanup failed, family observation unverified. Not an equivalent completed-task performance baseline."
+    }
+  },
+  "review_followup": {
+    "source": "4ebd0f60e860daa57a7033c6e77ea7f5f4b8ac97",
+    "findings": [
+      "https://github.com/morluto/rea/pull/4605#discussion_r4299895070",
+      "https://github.com/morluto/rea/pull/4605#discussion_r4299895076"
+    ],
+    "root_cause": "Success-only gap finalization and silent non-callable call/apply forwarding.",
+    "fix": "The once owner finalizes its missing gap in finally, after restoring scope; the callable metadata owner records failed non-callable dispatch reads without changing the returned value.",
+    "additional_cases": 7
+  },
+  "historical_ci": {
+    "head": "45473166e83f61e48c90732fb3f46ee8b4ad5cb7",
+    "run": 38974981554,
+    "failure": "Test shard1 binaryTargetAdmissionCancellation: retains the cleanup failure and its file owner when cancelled admission cannot close",
+    "scope": "Source-only attribution: binary admission test and producing process/application binary paths are unchanged by this Electron PR. No local reproduction or fix claimed.",
+    "job_log_sha256": "b903116753df0f481f32149ec26d25bb200a891649d46255e2f1d58bd97f3724"
+  }
+}
diff --git a/docs/verification/electron-native-once-2026-10-16.md b/docs/verification/electron-native-once-2026-10-16.md
new file mode 100644
index 0000000000..df9fc8f391
--- /dev/null
+++ b/docs/verification/electron-native-once-2026-10-16.md
@@ -0,0 +1,142 @@
+# Native Electron once dispatch — 2026-10-16
+
+#4593 was reported by review of #4562, but its source was already in main from
+#4389. The initial report was explicitly source-only; subsequent paired controls
+confirmed the bug. This change delegates `once` creation, firing and callable
+selection to the actual runtime and observes only established callback entry.
+CLI and MCP continue to share the same hook, event model, projection and retained
+Evidence. No new tool, schema, execution authority or analysis cache is introduced.
+
+## Paired native controls
+
+The baseline is `709b5cbdc15aa757f89c38ecd12e5a47710747a6`. Final source is
+`4ebd0f60e860daa57a7033c6e77ea7f5f4b8ac97`, including the two review-gap fixes below. Earlier source cohort
+`c0b52b5408fa97013798e6ecee885ccac08e7356` contains the fix; the final cleanup
+commit is `e60c4a1098321ed2a7f564ae35909a31d707694f`, which removes the obsolete fifth helper argument and
+unreachable copied call/apply dispatch branches after inspecting every caller.
+The pre-review gap-owner follow-up is `7f05f476c52498adba41d943ead1a86e7216ca76`. The adjacent JSON preserves
+source hashes and separate measurement cohorts, including the initial 93-row prefix.
+The final review JSONL contains 117 paired rows (39 inputs × 3 runtimes). The
+earlier 96-row JSONL remains unchanged, including its initial 93-row prefix. Both
+comparisons have identical native
+control facts in each before/after pair. Regenerable binaries, apps, profiles
+and multi-MB raw captures are excluded from Git.
+
+| Actual engine                                              | Cases | Baseline behavioral differences | Fixed differences |
+| ---------------------------------------------------------- | ----: | ------------------------------: | ----------------: |
+| Node 24.18.0 (pinned)                                      |    39 |                               4 |                 0 |
+| Official Node 24.21.0                                      |    39 |                              16 |                 0 |
+| Generic Electron 44.7.0 embedded Node 24.21.0, run as Node |    39 |                              16 |                 0 |
+
+The original 21-case reproduction found 0/9/9 differences respectively. The
+pre-review 32-case cohort found 1/13/13. The final 39-case suite adds readonly
+callback methods, emitter method invariants, native metadata writes, failure
+recovery and non-callable callback methods. The extra pinned-runtime difference is registration
+metadata ordering. On the newer runtimes, opaque callback methods can suppress
+callbacks under the old hook although native dispatch executes them. The pinned
+runtime also catches false invocation records when an opaque method legitimately
+skips the callback. The added regression fails on the baseline for that false fact.
+
+These are **controlled producer cases with a minimal Electron module**, including
+the actual embedded Node binary, not a real GUI application's natural callback
+loss. Native traces, receiver checks, failures and remaining listeners are compared
+exactly. Expected property reads are derived from each runtime rather than copied
+from one Node implementation. The custom-apply guard still checks its original
+Arguments representation when the runtime actually invokes that method.
+
+## Ownership and uncertainty
+
+Native once wrappers keep their public callback identity and descriptor attributes.
+The registration receiver forwards methods/getters to the original emitter and
+supports readonly method descriptors. A private callable receives an actual
+Arguments frame, avoiding application Array species/iterators when recording.
+Metadata recognition and admission share one bounded descriptor lookup.
+
+An application-selected opaque call/apply can bypass observation; a bounded
+`custom-call`/`custom-apply` gap replaces invented invocation facts. Opaque native
+metadata writes or registration lookups keep the exact original callback/native
+operation and emit `once-metadata` gaps. The temporary unobserved scope is restored
+even if registration throws. The 39-case suite checks this recovery, including a native alias that bypasses
+patched `on`; the once owner retains the observation gap for that path. #4513 raw
+recording-wrapper mutation remains explicitly unfixed.
+
+Review found two missing failure facts: a decorator can register through an
+unhooked alias and then throw, and a runtime can read a non-callable call/apply
+property before dispatch fails. Both new regressions fail on the pre-review
+source. The once owner now finalizes its missing gap in `finally`, after restoring
+the scope; the callable metadata owner records a failed gap while preserving the
+exact non-callable value. Error identity and native callback behavior are retained.
+
+Two short-lived proxies are used for an observable once registration. Metadata
+remains weakly retained, and existing event/serialization budgets remain in force.
+The added registration cost was not isolated; no speed or token improvement is
+claimed. The saved producer comparison is a correctness experiment, not a whole
+application performance benchmark. Its runner reports differences instead of
+exiting unsuccessfully for an expected bad baseline; the regression tests assert
+that fixed behavior matches native behavior and observation claims are truthful.
+
+## Real application verification
+
+Unchanged Joplin Desktop 3.7.21 ASAR and explicit generic Electron 44.7.0 run the
+shipped welcome note/1075×666 PNG → actual resource context menu → app bridge →
+blocked reveal workflow. The image stays visible, page errors remain empty,
+reveal events increase 0→1, and the shared retained capture contains the exact
+event. Both staged hook files are hashed against the selected source before launch.
+No synthetic application IPC channels or replacement app callbacks are added.
+
+The argv shim is an explicit test adapter for the still-failing standard startup
+#2974. **Overall provider cleanup remains failed (#4282)** and the verifier exits
+nonzero. External scope teardown is not provider cleanup. The first frozen real
+pipeline takes 17.680 s; observed payload-exit CPU 16.272793 s and peak 1,395,253,248 B
+have an extra descendant, so complete-family observation is **unverified**. The
+cleanup cohort is recorded separately. The pre-review 32-case source repeats the real
+operation successfully, but overall cleanup still fails: 18.074 s pipeline, observed
+CPU 17.011774 s / peak 1,422,839,808 B; complete-family measurement remains unverified. No completed public CLI/MCP workflow,
+real Windows/macOS run, natural app callback-loss reproduction or full check:pr
+is claimed.
+
+The final review source repeats the same real operation: 18.353 s pipeline,
+observed CPU 17.098599 s / peak 1,387,556,864 B; complete-family measurement remains
+unverified and overall provider cleanup fails. An earlier trial failed to initialize
+the display because the provider environment omits XAUTHORITY. That launch is
+preserved separately; the fresh final trial uses local Xvfb with `-nolisten tcp -ac`,
+not a production provider change.
+
+Frozen local validation: 75 hook cases on both Node versions; 5 projection + 8 MCP
+cases on the unchanged shared contracts; static checks pass (final 118.946 s wall / 117.752622 s CPU / 4,282,826,752 B
+cgroup peak, verified payload-exit family observation). The pinned final run uses
+`test:focused`; an attempted `test:local` invocation was rejected before tests ran
+and is recorded as not executed. See JSON for exact
+commands/cohorts, failed candidate attempts, source pins and measured resources.
+Failures include the Array-species frame, readonly receiver invariants, metadata
+setter identity, on-getter ordering, a lint/interoperability correction and helper
+preparation failures. They are not relabeled as results from the final source.
+
+All heavy work runs serially with CPU 10/quota 1, 8 GiB hard/6 GiB early/no swap/192 tasks.
+Counters are captured at payload exit with the observer alive, not final whole-scope
+counters; cgroup peak includes file cache. Each final Joplin run has a new private
+configuration mount. Filesystem/runtime/build caches are warm; cold-system and
+warm-repeat costs are unmeasured. Agent/billed tokens and public reply/context
+costs are unmeasured. The broad internal error capture size is not an agent-token
+measurement. All owned scopes are checked inactive/dead independently.
+
+## Reproduce the producer comparison
+
+Use the pinned project toolchain and explicitly provided alternate runtimes.
+The alternate Node 24.21 archive is checked against [official checksums](https://nodejs.org/download/release/v24.21.0/SHASUMS256.txt);
+its archive/binary hashes are recorded. No global toolchain is upgraded.
+
+```sh
+python3 experiments/analysis-efficiency/electron-once-runtimes.py \
+  --hook-root /absolute/checkout-to-measure \
+  --node /absolute/pinned-node \
+  --node /absolute/node24.21 \
+  --electron /absolute/generic-electron44.7 \
+  --output /absolute/owned-output
+```
+
+Run this under the recorded resource wrapper. For a baseline comparison, use a
+clean checkout of 709b5cbd as hook-root while keeping the same current oracle/runner.
+The runner retains full JSON and prints a compact summary. The real Joplin recipe
+is in [the shell verifier record](electron-shell-sync-2026-10-16.md); select the
+current runtime-root. That workflow must remain nonzero while cleanup fails.
diff --git a/docs/verification/electron-native-once-2026-10-16.review.rows.jsonl b/docs/verification/electron-native-once-2026-10-16.review.rows.jsonl
new file mode 100644
index 0000000000..0e525ddd56
--- /dev/null
+++ b/docs/verification/electron-native-once-2026-10-16.review.rows.jsonl
@@ -0,0 +1,117 @@
+{"runtime":0,"mode":"plain","arguments":0,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":0,"mode":"plain","arguments":1,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":0,"mode":"plain","arguments":3,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":0,"mode":"call-opaque","arguments":0,"native":{"body_calls":0,"correct_receiver":true,"trace":["opaque:call"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:call"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:call"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"custom-call","error":false}]}
+{"runtime":0,"mode":"call-opaque","arguments":1,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":0,"mode":"call-opaque","arguments":3,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":0,"mode":"apply-opaque","arguments":0,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":0,"mode":"apply-opaque","arguments":1,"native":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"custom-apply","error":false}]}
+{"runtime":0,"mode":"apply-opaque","arguments":3,"native":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"custom-apply","error":false}]}
+{"runtime":0,"mode":"call-readonly","arguments":0,"native":{"body_calls":0,"correct_receiver":true,"trace":["opaque:call"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:call"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:call"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"custom-call","error":false}]}
+{"runtime":0,"mode":"call-readonly","arguments":1,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":0,"mode":"call-readonly","arguments":3,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
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+{"runtime":0,"mode":"apply-readonly","arguments":1,"native":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"custom-apply","error":false}]}
+{"runtime":0,"mode":"apply-readonly","arguments":3,"native":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"custom-apply","error":false}]}
+{"runtime":0,"mode":"call-getter","arguments":0,"native":{"body_calls":0,"correct_receiver":true,"trace":["get:call","opaque:call"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["get:call","opaque:call"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":0,"correct_receiver":true,"trace":["get:call","opaque:call"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"custom-call","error":false}]}
+{"runtime":0,"mode":"call-getter","arguments":1,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":0,"mode":"call-getter","arguments":3,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
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+{"runtime":2,"mode":"call-readonly","arguments":3,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"apply-readonly","arguments":0,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"apply-readonly","arguments":1,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"apply-readonly","arguments":3,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["opaque:apply"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"call-getter","arguments":0,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["get:call","opaque:call"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"call-getter","arguments":1,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"call-getter","arguments":3,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"apply-getter","arguments":0,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"apply-getter","arguments":1,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["get:apply","opaque:apply"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"apply-getter","arguments":3,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["get:apply","opaque:apply"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"call-throwing-getter","arguments":0,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["get:call"],"error":"Error: getter:call","listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":true}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"call-throwing-getter","arguments":1,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"call-throwing-getter","arguments":3,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"apply-throwing-getter","arguments":0,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:0"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"apply-throwing-getter","arguments":1,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["get:apply"],"error":"Error: getter:apply","listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:1"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":true}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"apply-throwing-getter","arguments":3,"native":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_hooked":{"body_calls":0,"correct_receiver":true,"trace":["get:apply"],"error":"Error: getter:apply","listeners_after":0},"candidate_hooked":{"body_calls":1,"correct_receiver":true,"trace":["body:3"],"error":null,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":true}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"inherited-listener-setter","arguments":0,"native":{"body_calls":1,"writes":[true],"public_identity":false,"error":null},"baseline_hooked":{"body_calls":1,"writes":[true],"public_identity":false,"error":null},"candidate_hooked":{"body_calls":1,"writes":[true],"public_identity":false,"error":null},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"once-metadata","error":false}]}
+{"runtime":2,"mode":"on-getter-listener-setter","arguments":0,"native":{"body_calls":1,"reads":1,"writes":[true],"public_identity":false,"error":null},"baseline_hooked":{"body_calls":1,"reads":1,"writes":[],"public_identity":true,"error":null},"candidate_hooked":{"body_calls":1,"reads":1,"writes":[true],"public_identity":false,"error":null},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"once-metadata","error":false}]}
+{"runtime":2,"mode":"throwing-listener-setter","arguments":0,"native":{"body_calls":1,"writes":[true],"error":"Error: metadata-write","listeners_after":1},"baseline_hooked":{"body_calls":1,"writes":[true],"error":"Error: metadata-write","listeners_after":1},"candidate_hooked":{"body_calls":1,"writes":[true],"error":"Error: metadata-write","listeners_after":1},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":2,"mode":"readonly-emitter-methods","arguments":0,"native":{"body_calls":1,"seen":["on:true","removeListener:true"],"error":null},"baseline_hooked":{"body_calls":1,"seen":["on:true","removeListener:true"],"error":null},"candidate_hooked":{"body_calls":1,"seen":["on:true","removeListener:true"],"error":null},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"main-event-invocation","event":null,"error":false}]}
+{"runtime":0,"mode":"on-getter-native-alias","arguments":0,"native":{"body_calls":1,"reads":1,"listeners_after":0},"baseline_hooked":{"body_calls":1,"reads":1,"listeners_after":0},"candidate_hooked":{"body_calls":1,"reads":1,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"once-metadata","error":false}]}
+{"runtime":1,"mode":"on-getter-native-alias","arguments":0,"native":{"body_calls":1,"reads":1,"listeners_after":0},"baseline_hooked":{"body_calls":1,"reads":1,"listeners_after":0},"candidate_hooked":{"body_calls":1,"reads":1,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"once-metadata","error":false}]}
+{"runtime":2,"mode":"on-getter-native-alias","arguments":0,"native":{"body_calls":1,"reads":1,"listeners_after":0},"baseline_hooked":{"body_calls":1,"reads":1,"listeners_after":0},"candidate_hooked":{"body_calls":1,"reads":1,"listeners_after":0},"baseline_observation":[{"kind":"main-event-invocation","event":null,"error":false}],"candidate_observation":[{"kind":"ipc-observation-gap","event":"once-metadata","error":false}]}
diff --git a/experiments/analysis-efficiency/electron-once-runtime.mjs b/experiments/analysis-efficiency/electron-once-runtime.mjs
new file mode 100644
index 0000000000..903fbf7f8b
--- /dev/null
+++ b/experiments/analysis-efficiency/electron-once-runtime.mjs
@@ -0,0 +1,335 @@
+// Controlled producer oracle, not real-application/provider evidence. Stage
+// this file beside a minimal Electron module and the actual unmodified hook.
+import { EventEmitter } from "node:events";
+import { createRequire } from "node:module";
+import { pathToFileURL } from "node:url";
+
+if (process.argv[2]) await import(pathToFileURL(process.argv[2]));
+// Match the hook's CommonJS module identity. Electron's ESM bare-module
+// resolver can select its builtin even when run as Node with a staged fixture.
+const { ipcMain } = createRequire(import.meta.url)("electron");
+if (globalThis.__reaElectronActiveSnapshot?.().hook_error !== false)
+  throw new Error("The canonical hook must be installed without errors");
+
+const modes = [
+  "plain",
+  "call-opaque",
+  "apply-opaque",
+  "call-readonly",
+  "apply-readonly",
+  "call-getter",
+  "apply-getter",
+  "call-throwing-getter",
+  "apply-throwing-getter",
+  "call-non-callable",
+  "apply-non-callable",
+];
+
+const execute = (emitter, channel, mode, argumentCount) => {
+  let bodyCalls = 0;
+  let correctReceiver = true;
+  const trace = [];
+  const listener = function listener() {
+    bodyCalls += 1;
+    correctReceiver &&= this === emitter;
+    trace.push(`body:${arguments.length}`);
+  };
+  if (mode !== "plain") {
+    const method = mode.startsWith("call") ? "call" : "apply";
+    const opaque = () => trace.push(`opaque:${method}`);
+    if (mode.includes("getter"))
+      Object.defineProperty(listener, method, {
+        get() {
+          trace.push(`get:${method}`);
+          if (mode.includes("throwing")) throw new Error(`getter:${method}`);
+          return opaque;
+        },
+      });
+    else if (mode.includes("readonly"))
+      Object.defineProperty(listener, method, { value: opaque });
+    else listener[method] = mode.includes("non-callable") ? null : opaque;
+  }
+  emitter.once(channel, listener);
+  let error = null;
+  try {
+    emitter.emit(
+      channel,
+      ...Array.from({ length: argumentCount }, (_, i) => i),
+    );
+    emitter.emit(channel, "must-not-run-twice");
+  } catch (cause) {
+    error = String(cause);
+  }
+  return {
+    body_calls: bodyCalls,
+    correct_receiver: correctReceiver,
+    trace,
+    error,
+    listeners_after: emitter.listenerCount(channel),
+  };
+};
+
+const rows = [];
+for (const mode of modes)
+  for (const argumentCount of [0, 1, 3]) {
+    const channel = `${mode}:${argumentCount}`;
+    const native = execute(new EventEmitter(), channel, mode, argumentCount);
+    const hooked = execute(ipcMain, channel, mode, argumentCount);
+    const events = globalThis
+      .__reaElectronActiveSnapshot()
+      .events.filter((event) => event.channel === channel);
+    rows.push({
+      mode,
+      argument_count: argumentCount,
+      native,
+      hooked,
+      semantic_match: JSON.stringify(native) === JSON.stringify(hooked),
+      observation: events.map(({ kind, event, error }) => ({
+        kind,
+        event,
+        error,
+      })),
+    });
+  }
+
+const additional = (mode, scenario) => {
+  const channel = `metadata:${mode}`;
+  const native = scenario(new EventEmitter(), channel);
+  const hooked = scenario(ipcMain, channel);
+  rows.push({
+    mode,
+    argument_count: 0,
+    native,
+    hooked,
+    semantic_match: JSON.stringify(native) === JSON.stringify(hooked),
+    observation: globalThis
+      .__reaElectronActiveSnapshot()
+      .events.filter((event) => event.channel === channel)
+      .map(({ kind, event, error }) => ({ kind, event, error })),
+  });
+};
+
+additional("inherited-listener-setter", (emitter, channel) => {
+  const original = Object.getOwnPropertyDescriptor(
+    Function.prototype,
+    "listener",
+  );
+  const writes = [];
+  let bodyCalls = 0;
+  const listener = () => {
+    bodyCalls += 1;
+  };
+  Object.defineProperty(Function.prototype, "listener", {
+    configurable: true,
+    set(value) {
+      writes.push(value === listener);
+    },
+  });
+  let error = null;
+  try {
+    emitter.once(channel, listener);
+  } catch (cause) {
+    error = String(cause);
+  } finally {
+    if (original)
+      Object.defineProperty(Function.prototype, "listener", original);
+    else delete Function.prototype.listener;
+  }
+  const publicIdentity =
+    emitter.rawListeners(channel)[0]?.listener === listener;
+  emitter.emit(channel);
+  return {
+    body_calls: bodyCalls,
+    writes,
+    public_identity: publicIdentity,
+    error,
+  };
+});
+
+additional("on-getter-listener-setter", (emitter, channel) => {
+  const prototypeMetadata = Object.getOwnPropertyDescriptor(
+    Function.prototype,
+    "listener",
+  );
+  const onMetadata = Object.getOwnPropertyDescriptor(emitter, "on");
+  const on = emitter.on;
+  let reads = 0,
+    bodyCalls = 0,
+    error = null;
+  const writes = [];
+  const listener = () => {
+    bodyCalls += 1;
+  };
+  Object.defineProperty(emitter, "on", {
+    configurable: true,
+    get() {
+      reads += 1;
+      Object.defineProperty(Function.prototype, "listener", {
+        configurable: true,
+        set(value) {
+          writes.push(value === listener);
+        },
+      });
+      return on;
+    },
+  });
+  try {
+    emitter.once(channel, listener);
+  } catch (cause) {
+    error = String(cause);
+  } finally {
+    if (prototypeMetadata)
+      Object.defineProperty(Function.prototype, "listener", prototypeMetadata);
+    else delete Function.prototype.listener;
+    if (onMetadata) Object.defineProperty(emitter, "on", onMetadata);
+    else delete emitter.on;
+  }
+  const publicIdentity =
+    emitter.rawListeners(channel)[0]?.listener === listener;
+  emitter.emit(channel);
+  return {
+    body_calls: bodyCalls,
+    reads,
+    writes,
+    public_identity: publicIdentity,
+    error,
+  };
+});
+
+additional("on-getter-native-alias", (emitter, channel) => {
+  const original = Object.getOwnPropertyDescriptor(emitter, "on");
+  let reads = 0,
+    bodyCalls = 0;
+  const listener = () => {
+    bodyCalls += 1;
+  };
+  Object.defineProperty(emitter, "on", {
+    configurable: true,
+    get() {
+      reads += 1;
+      return EventEmitter.prototype.on;
+    },
+  });
+  try {
+    emitter.once(channel, listener);
+  } finally {
+    if (original) Object.defineProperty(emitter, "on", original);
+    else delete emitter.on;
+  }
+  emitter.emit(channel);
+  return {
+    body_calls: bodyCalls,
+    reads,
+    listeners_after: emitter.listenerCount(channel),
+  };
+});
+
+additional("on-getter-native-alias-throws", (emitter, channel) => {
+  const original = Object.getOwnPropertyDescriptor(emitter, "on");
+  const failure = new Error("registered-before-error");
+  let bodyCalls = 0,
+    sameError = false;
+  const listener = () => {
+    bodyCalls += 1;
+  };
+  Object.defineProperty(emitter, "on", {
+    configurable: true,
+    get() {
+      return function registerThenThrow(name, callback) {
+        EventEmitter.prototype.on.call(this, name, callback);
+        throw failure;
+      };
+    },
+  });
+  try {
+    emitter.once(channel, listener);
+  } catch (cause) {
+    sameError = cause === failure;
+  } finally {
+    if (original) Object.defineProperty(emitter, "on", original);
+    else delete emitter.on;
+  }
+  const publicIdentity =
+    emitter.rawListeners(channel)[0]?.listener === listener;
+  emitter.emit(channel);
+  return {
+    body_calls: bodyCalls,
+    same_error: sameError,
+    public_identity: publicIdentity,
+    listeners_after: emitter.listenerCount(channel),
+  };
+});
+
+additional("throwing-listener-setter", (emitter, channel) => {
+  const original = Object.getOwnPropertyDescriptor(
+    Function.prototype,
+    "listener",
+  );
+  const writes = [];
+  let bodyCalls = 0,
+    error = null;
+  const listener = () => {
+    bodyCalls += 1;
+  };
+  Object.defineProperty(Function.prototype, "listener", {
+    configurable: true,
+    set(value) {
+      writes.push(value === listener);
+      throw new Error("metadata-write");
+    },
+  });
+  try {
+    emitter.once(channel, listener);
+  } catch (cause) {
+    error = String(cause);
+  } finally {
+    if (original)
+      Object.defineProperty(Function.prototype, "listener", original);
+    else delete Function.prototype.listener;
+  }
+  // A failed registration must not leave later registrations unobservable.
+  emitter.on(channel, listener);
+  emitter.emit(channel);
+  return {
+    body_calls: bodyCalls,
+    writes,
+    error,
+    listeners_after: emitter.listenerCount(channel),
+  };
+});
+
+additional("readonly-emitter-methods", (emitter, channel) => {
+  const seen = [];
+  for (const key of ["on", "removeListener"]) {
+    const original = emitter[key];
+    Object.defineProperty(emitter, key, {
+      value: function readonlyMethod(...args) {
+        seen.push(`${key}:${this === emitter}`);
+        return Reflect.apply(original, this, args);
+      },
+      configurable: false,
+      writable: false,
+    });
+  }
+  let bodyCalls = 0,
+    error = null;
+  const listener = () => {
+    bodyCalls += 1;
+  };
+  try {
+    emitter.once(channel, listener);
+    emitter.emit(channel);
+  } catch (cause) {
+    error = String(cause);
+  }
+  return { body_calls: bodyCalls, seen, error };
+});
+console.log(
+  JSON.stringify({
+    node: process.versions.node,
+    electron: process.versions.electron ?? null,
+    cases: rows.length,
+    disagreements: rows.filter((row) => !row.semantic_match).length,
+    rows,
+  }),
+);
diff --git a/experiments/analysis-efficiency/electron-once-runtimes.py b/experiments/analysis-efficiency/electron-once-runtimes.py
new file mode 100644
index 0000000000..4beaa5deb8
--- /dev/null
+++ b/experiments/analysis-efficiency/electron-once-runtimes.py
@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+"""Serial native/hooked producer controls; not real-application evidence."""
+
+import argparse
+import hashlib
+import json
+import os
+from pathlib import Path
+import shutil
+import subprocess
+import tempfile
+
+
+def sha256(path):
+    with path.open("rb") as stream:
+        return hashlib.file_digest(stream, "sha256").hexdigest()
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--hook-root", type=Path, required=True)
+    parser.add_argument("--node", type=Path, action="append", required=True)
+    parser.add_argument("--electron", type=Path)
+    parser.add_argument("--output", type=Path, required=True)
+    arguments = parser.parse_args()
+    arguments.output.mkdir(parents=True, exist_ok=True)
+    packet = Path(tempfile.mkdtemp(prefix="native-once-", dir=arguments.output))
+    stage = packet / "staged"
+    module = stage / "node_modules/electron"
+    module.mkdir(parents=True)
+    fixture = module / "index.js"
+    fixture.write_text(
+        'const { EventEmitter } = require("node:events");\n'
+        "module.exports = { app: new EventEmitter(), ipcMain: new EventEmitter() };\n"
+    )
+    sources = [
+        arguments.hook_root / "scripts/electron-active-hook.cjs",
+        arguments.hook_root / "scripts/electron-active-hook-boundaries.cjs",
+        Path(__file__).with_name("electron-once-runtime.mjs"),
+    ]
+    pins = {path.name: sha256(path) for path in sources}
+    pins["electron-fixture"] = sha256(fixture)
+    for source in sources:
+        shutil.copyfile(source, stage / source.name)
+    engines = [(engine, False) for engine in arguments.node]
+    if arguments.electron is not None:
+        engines.append((arguments.electron, True))
+    results = []
+    for index, (engine, run_as_node) in enumerate(engines):
+        selected = engine.absolute()
+        environment = dict(os.environ)
+        if run_as_node:
+            environment["ELECTRON_RUN_AS_NODE"] = "1"
+        execution = subprocess.run(
+            [str(selected), str(stage / sources[-1].name), str(stage / sources[0].name)],
+            env=environment,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            timeout=15,
+            check=False,
+        )
+        (packet / f"engine-{index}.stdout").write_bytes(execution.stdout)
+        (packet / f"engine-{index}.stderr").write_bytes(execution.stderr)
+        receipt = {
+            "selected_binary": str(engine),
+            "absolute_binary": str(selected),
+            "binary_sha256": sha256(selected),
+            "electron_run_as_node": run_as_node,
+            "exit_code": execution.returncode,
+            "stdout_sha256": hashlib.sha256(execution.stdout).hexdigest(),
+            "stderr_sha256": hashlib.sha256(execution.stderr).hexdigest(),
+        }
+        if execution.returncode == 0:
+            receipt["result"] = json.loads(execution.stdout)
+        results.append(receipt)
+        report = {"hook_root": str(arguments.hook_root), "source_sha256": pins,
+                  "engines": results, "scope": __doc__}
+        (packet / "report.json").write_text(json.dumps(report, indent=2) + "\n")
+        if execution.returncode != 0:
+            raise RuntimeError(f"Engine failed; preserved receipt at {packet}")
+    print(json.dumps({"packet": str(packet), "engines": [
+        {"node": row["result"]["node"], "electron": row["result"]["electron"],
+         "cases": row["result"]["cases"],
+         "disagreements": row["result"]["disagreements"]} for row in results
+    ]}))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/experiments/analysis-efficiency/joplin-shell-boundary.mjs b/experiments/analysis-efficiency/joplin-shell-boundary.mjs
index 8f38ebba8d..cfa5b684c0 100644
--- a/experiments/analysis-efficiency/joplin-shell-boundary.mjs
+++ b/experiments/analysis-efficiency/joplin-shell-boundary.mjs
@@ -2,8 +2,9 @@
 // Unchanged Joplin ASAR and its shipped welcome note/attachment. The actual
 // resource context menu, bridge and shell call execute; menu automation is explicit.
 import assert from "node:assert/strict";
-import { mkdtemp, writeFile } from "node:fs/promises";
-import { join, resolve } from "node:path";
+import { createHash } from "node:crypto";
+import { mkdtemp, readFile, writeFile } from "node:fs/promises";
+import { dirname, join, resolve } from "node:path";
 import { pathToFileURL } from "node:url";
 import { parseArgs } from "node:util";
 import { _electron } from "playwright-core";
@@ -39,6 +40,7 @@ const profile = await mkdtemp(
 let application;
 let child;
 let probe;
+let stagedHookHashes;
 const started = performance.now();
 const controller = new AbortController();
 const deadline = setTimeout(
@@ -46,7 +48,39 @@ const deadline = setTimeout(
   45_000,
 );
 
+const verifyHookSources = async (stagedHook) => {
+  const hashes = {};
+  for (const name of [
+    "electron-active-hook.cjs",
+    "electron-active-hook-boundaries.cjs",
+  ]) {
+    const hash = (data) => createHash("sha256").update(data).digest("hex");
+    const actualPath =
+      name === "electron-active-hook.cjs"
+        ? stagedHook
+        : join(dirname(stagedHook), name);
+    const [actual, expected] = await Promise.all([
+      readFile(actualPath).then(hash),
+      readFile(join(runtime, "scripts", name)).then(hash),
+    ]);
+    assert.equal(
+      actual,
+      expected,
+      `The staged ${name} must match the selected runtime source`,
+    );
+    hashes[name] = actual;
+  }
+  return hashes;
+};
+
 const launch = async (options) => {
+  const stagedIndex = options.args.indexOf("-r");
+  assert.notEqual(
+    stagedIndex,
+    -1,
+    "Expected the provider's staged require pair",
+  );
+  stagedHookHashes = await verifyHookSources(options.args[stagedIndex + 1]);
   let launchOptions = options;
   if (values["argv-shim-transport"]) {
     // Explicit test adapter for #2974, not the public provider launch path.
@@ -246,6 +280,7 @@ try {
     JSON.stringify({
       profile,
       runtime,
+      staged_hook_sha256: stagedHookHashes,
       elapsed_ms: performance.now() - started,
       launch_transport: values["argv-shim-transport"]
         ? "controlled-argv-shim"
diff --git a/scripts/electron-active-hook.cjs b/scripts/electron-active-hook.cjs
index c8892594b0..6e535ee338 100644
--- a/scripts/electron-active-hook.cjs
+++ b/scripts/electron-active-hook.cjs
@@ -8,6 +8,7 @@ const arrayFrom = Array.from;
 const defineProperty = Object.defineProperty;
 const ownPropertyDescriptor = Object.getOwnPropertyDescriptor;
 const getPrototypeOf = Object.getPrototypeOf;
+const nativeFunctionPrototype = getPrototypeOf(callFunction);
 const getProperty = Reflect.get;
 const setProperty = Reflect.set;
 const SetConstructor = Set;
@@ -379,13 +380,7 @@ const recordInvocation = (kind, channel, event, args) =>
     error: false,
   });
 
-const invokeObservedEventListener = (
-  thisArg,
-  channel,
-  listener,
-  args,
-  nativeMethod,
-) => {
+const invokeObservedEventListener = (thisArg, channel, listener, args) => {
   // Recording slices an actual invocation frame, avoiding Array species;
   // callback dispatch keeps its native Array/Arguments representation.
   const recorded = recordInvocation(
@@ -395,8 +390,6 @@ const invokeObservedEventListener = (
     sliceArguments(args, 1),
   );
   try {
-    if (nativeMethod === "call") return listener.call(thisArg);
-    if (nativeMethod === "apply") return listener.apply(thisArg, args);
     return applyFunction(listener, thisArg, args);
   } catch (cause) {
     if (recorded !== null) recorded.error = true;
@@ -418,9 +411,9 @@ const invokeObservedEventListener = (
 const hookListenerRemovalTargets = new WeakMap();
 const MAX_LISTENER_CHAIN_HOPS = 16;
 
-// Follow native property lookup without invoking application getters or Proxy
-// traps. Undefined means the readable link is absent; null means unknown.
-const listenerDataDescriptor = (listener) => {
+// Parse native property lookup without invoking application getters or Proxy
+// traps. Undefined means absent; null means the lookup is unknown.
+const lookupPropertyDescriptor = (listener, key) => {
   let candidate = listener;
   for (
     let hops = 0;
@@ -428,17 +421,21 @@ const listenerDataDescriptor = (listener) => {
     hops += 1
   ) {
     if (isProxy(candidate)) return null;
-    const descriptor = ownPropertyDescriptor(candidate, "listener");
-    if (descriptor !== undefined) {
-      if (hasOwnProperty(descriptor, "value")) return descriptor;
-      // A setter-only property shadows ancestors with a known undefined read.
-      return descriptor.get === undefined ? undefined : null;
-    }
+    const descriptor = ownPropertyDescriptor(candidate, key);
+    if (descriptor !== undefined) return descriptor;
     candidate = getPrototypeOf(candidate);
   }
   return candidate === null ? undefined : null;
 };
 
+const listenerDataDescriptor = (listener) => {
+  const descriptor = lookupPropertyDescriptor(listener, "listener");
+  if (descriptor === null || descriptor === undefined) return descriptor;
+  if (hasOwnProperty(descriptor, "value")) return descriptor;
+  // A setter-only property shadows ancestors with a known undefined read.
+  return descriptor.get === undefined ? undefined : null;
+};
+
 // A decorator that wraps once's hook wrapper and names it through `.listener`
 // already records through that wrapper. Registering the decorator as is keeps
 // native self-removal working: the once wrapper removes itself by identity, and
@@ -461,9 +458,67 @@ const classifyHookListenerWrapper = (listener) => {
   return typeof candidate === "function" ? "unknown" : "unowned";
 };
 
+const createObservedOnceCallback = (target, channel, listener, receiver) => {
+  // A private callable target avoids Proxy get invariants on an app's
+  // non-configurable, read-only call/apply properties. It never escapes
+  // through the native once wrapper's public listener link.
+  const callback = new ProxyConstructor(
+    function observedOnceListener() {
+      return invokeObservedEventListener(
+        this === receiver ? target : this,
+        channel,
+        listener,
+        arguments,
+      );
+    },
+    {
+      get: (_callable, key) => {
+        let value;
+        try {
+          value = getProperty(listener, key, listener);
+        } catch (cause) {
+          if (key === "call" || key === "apply")
+            recordIpcObservationGap(channel, `custom-${key}`, true);
+          throw cause;
+        }
+        if (key !== "call" && key !== "apply") return value;
+        if (typeof value !== "function") {
+          recordIpcObservationGap(channel, `custom-${key}`, true);
+          return value;
+        }
+        if (value === callFunction || value === applyArguments) return value;
+        // A runtime that selects an application method must preserve that
+        // method's receiver and original argument-list object. Its body may
+        // bypass the callable Proxy, so retain a gap rather than an invocation.
+        return new ProxyConstructor(value, {
+          apply: (method, thisArg, args) => {
+            const gap = recordIpcObservationGap(channel, `custom-${key}`);
+            if (args[0] === receiver) args[0] = target;
+            try {
+              return applyFunction(
+                method,
+                thisArg === callback ? listener : thisArg,
+                args,
+              );
+            } catch (cause) {
+              if (gap !== null) {
+                gap.error = true;
+                gap.phase = "failed";
+              }
+              throw cause;
+            }
+          },
+        });
+      },
+    },
+  );
+  return callback;
+};
+
 const patchIpcMain = (ipcMain) => {
   if (ipcMain === null || ipcMain === undefined) return;
   const { handle, on, once, removeAllListeners } = ipcMain;
+  let unobservedOnceScope = null;
   if (typeof handle === "function")
     ipcMain.handle = function patchedIpcMainHandle(channel, listener) {
       if (typeof listener !== "function")
@@ -492,6 +547,13 @@ const patchIpcMain = (ipcMain) => {
   if (typeof on !== "function") return;
   ipcMain.on = function patchedIpcMainOn(channel, listener) {
     if (typeof listener !== "function") return on.call(this, channel, listener);
+    if (unobservedOnceScope !== null) {
+      const scope = unobservedOnceScope;
+      const result = on.call(this, channel, listener);
+      recordIpcObservationGap(channel, "once-metadata");
+      if (scope.channel === channel) scope.gapRecorded = true;
+      return result;
+    }
     const wrapperStatus = classifyHookListenerWrapper(listener);
     if (wrapperStatus !== "unowned") {
       const result = on.call(this, channel, listener);
@@ -549,30 +611,81 @@ const patchIpcMain = (ipcMain) => {
     weakMapSet(hookListenerRemovalTargets, wrapped, listener);
     return on.call(this, channel, wrapped);
   };
-  // Mirror EventEmitter#once and _onceWrap: resolve this.on at registration
-  // and target.removeListener at firing, so later decorators observe both.
+  // Native once owns firing, removal and callback dispatch. Node versions
+  // differ in whether they read callback.call/apply. Observe actual invocation
+  // through a private callable Proxy instead of copying either implementation.
   if (typeof once === "function")
     ipcMain.once = function patchedIpcMainOnce(channel, listener) {
-      if (typeof listener !== "function")
+      if (
+        typeof listener !== "function" ||
+        this === null ||
+        (typeof this !== "object" && typeof this !== "function")
+      )
         return once.call(this, channel, listener);
       const target = this;
-      let fired = false;
-      const wrapped = function wrappedOnceEventListener() {
-        if (fired) return undefined;
-        target.removeListener(channel, wrapped);
-        fired = true;
-        return invokeObservedEventListener(
-          target,
-          channel,
-          listener,
-          arguments,
-          arguments.length === 0 ? "call" : "apply",
-        );
-      };
-      wrapped.listener = listener;
-      weakMapSet(hookListenerRemovalTargets, wrapped, wrapped);
-      this.on(channel, wrapped);
-      return this;
+      const metadata = lookupPropertyDescriptor(
+        nativeFunctionPrototype,
+        "listener",
+      );
+      const onMetadata = lookupPropertyDescriptor(target, "on");
+      if (
+        metadata === null ||
+        (metadata !== undefined && !hasOwnProperty(metadata, "value")) ||
+        onMetadata === null ||
+        (onMetadata !== undefined && !hasOwnProperty(onMetadata, "value"))
+      ) {
+        // Native wrapper creation can expose its callback through an inherited
+        // setter/Proxy, including one installed by an on getter. Pass the exact
+        // app callback; registrations in this synchronous scope stay unwrapped.
+        const previousScope = unobservedOnceScope;
+        const scope = { channel, gapRecorded: false };
+        let failed = true;
+        unobservedOnceScope = scope;
+        try {
+          const result = applyFunction(once, target, [channel, listener]);
+          failed = false;
+          return result;
+        } finally {
+          unobservedOnceScope = previousScope;
+          // An app decorator can register through an unhooked alias and then
+          // throw. Preserve a gap for either outcome, not proof of registration.
+          if (!scope.gapRecorded)
+            recordIpcObservationGap(channel, "once-metadata", failed);
+        }
+      }
+      const receiver = new ProxyConstructor(
+        { __proto__: null },
+        {
+          get: (_target, key) => {
+            const value = getProperty(target, key, target);
+            if (
+              (key !== "on" && key !== "removeListener") ||
+              typeof value !== "function"
+            )
+              return value;
+            return function forwardOnceOperation(...args) {
+              if (key === "on") {
+                const wrapped = args[1];
+                defineProperty(wrapped, "listener", {
+                  ...ownPropertyDescriptor(wrapped, "listener"),
+                  value: listener,
+                });
+                weakMapSet(hookListenerRemovalTargets, wrapped, wrapped);
+              }
+              return applyFunction(value, target, args);
+            };
+          },
+          set: (_target, key, value) => setProperty(target, key, value, target),
+        },
+      );
+      const callback = createObservedOnceCallback(
+        target,
+        channel,
+        listener,
+        receiver,
+      );
+      const result = applyFunction(once, receiver, [channel, callback]);
+      return result === receiver ? target : result;
     };
   if (typeof removeAllListeners !== "function") return;
   // Node owns its live-array traversal. A forwarding receiver translates only
diff --git a/tests/boundary/browser/electronActiveHook.test.ts b/tests/boundary/browser/electronActiveHook.test.ts
index 093169b20c..7547d6f0ca 100644
--- a/tests/boundary/browser/electronActiveHook.test.ts
+++ b/tests/boundary/browser/electronActiveHook.test.ts
@@ -940,6 +940,70 @@ process.stdout.write(JSON.stringify({ plain: scenario(new EventEmitter()), hooke
   expect(hooked).toEqual(plain);
 });
 
+it("matches native once dispatch and retains only established invocations", async () => {
+  const root = await createTestTempDirectory("rea-electron-hook-native-once-");
+  temporary.push(root);
+  await writeElectronFixture(root);
+  const script = join(root, "electron-once-runtime.mjs");
+  await copyFile(
+    fileURLToPath(
+      new URL(
+        "../../../experiments/analysis-efficiency/electron-once-runtime.mjs",
+        import.meta.url,
+      ),
+    ),
+    script,
+  );
+  const execution = await runNode(script, root);
+  expect(execution.code, execution.stderr).toBe(0);
+  const result = JSON.parse(execution.stdout) as {
+    cases: number;
+    disagreements: number;
+    rows: readonly {
+      mode: string;
+      native: Record<string, unknown>;
+      hooked: Record<string, unknown> & { body_calls: number };
+      observation: readonly { kind: string; event: string | null }[];
+    }[];
+  };
+  expect(result.cases).toBe(39);
+  expect(result.disagreements).toBe(0);
+  for (const row of result.rows) {
+    expect(row.hooked, row.mode).toEqual(row.native);
+    const invocations = row.observation.filter(
+      (event) => event.kind === "main-event-invocation",
+    );
+    if (
+      row.mode === "inherited-listener-setter" ||
+      row.mode === "on-getter-listener-setter" ||
+      row.mode.startsWith("on-getter-native-alias")
+    ) {
+      expect(invocations).toEqual([]);
+      expect(row.observation).toEqual([
+        {
+          kind: "ipc-observation-gap",
+          event: "once-metadata",
+          error: row.mode === "on-getter-native-alias-throws",
+        },
+      ]);
+    } else {
+      expect(invocations.length, row.mode).toBe(row.hooked.body_calls);
+      if (row.hooked.body_calls === 0)
+        expect(
+          row.observation.some((event) => event.kind === "ipc-observation-gap"),
+          row.mode,
+        ).toBe(true);
+      if (row.mode.includes("non-callable") && row.hooked.body_calls === 0)
+        expect(row.observation, row.mode).toEqual([
+          expect.objectContaining({
+            kind: "ipc-observation-gap",
+            error: true,
+          }),
+        ]);
+    }
+  }
+});
+
 it.each(["single-on", "multiple-on", "empty-once", "event-once"])(
   "preserves native callable method reads during %s dispatch",
   async (mode) => {
@@ -985,16 +1049,11 @@ console.log(JSON.stringify({ plain: scenario(new EventEmitter()), hooked: scenar
       plain: Record<string, unknown>;
       hooked: Record<string, unknown>;
     };
-    expect(plain).toEqual({
-      calls: mode === "multiple-on" ? ["first", "second"] : [],
-      reads:
-        mode === "multiple-on"
-          ? []
-          : [mode === "empty-once" ? "call" : "apply"],
-      failure:
-        mode === "multiple-on" ? null : "application invocation metadata",
-      remaining: mode === "multiple-on" ? 2 : mode === "single-on" ? 1 : 0,
-    });
+    // The native dependency owns whether it consults call/apply. Compare the
+    // complete trace rather than requiring one pinned Node implementation.
+    expect(plain.remaining).toBe(
+      mode === "multiple-on" ? 2 : mode === "single-on" ? 1 : 0,
+    );
     expect(hooked).toEqual(plain);
   },
 );
@@ -1094,7 +1153,9 @@ console.log(JSON.stringify({ plain: scenario(new EventEmitter()), hooked: scenar
   };
   expect(plain).toEqual({
     calls: 1,
-    argumentObject: true,
+    // Newer runtimes bypass custom apply entirely. If native calls it, the
+    // callback's guard still requires its exact Arguments representation.
+    argumentObject: expect.any(Boolean),
     correctReceiver: true,
     failure: null,
     remaining: 0,