fix(browser): isolate web bundle analysis with bounded partial results

Run inert captured-script analysis in owned children with per-script and aggregate deadlines, bounded source/result transfer and explicit per-script coverage. Preserve completed facts and exact cleanup authority across cancellation, mixed descriptor/process failures and cross-consumer retry.

Share aggregate source admission across page and Electron capture, expose CLI/MCP resource controls and retain selected parameters in Evidence. Verified with controlled CDP public workflows, real owned Node failure controls and the reporter-matching ReactDOM UMD artifact; real Chrome/Electron and Windows/Bun remain unqualified.

docs/browser-observation.md

@@ -350,6 +350,40 @@ validation and resource bounds. Omitted script metadata makes its affected
 section explicitly truncated.
 Disallowed-origin entries are filtered before retention.
 
+Selected script-source collection shares a 32 MiB aggregate UTF-8 retention
+budget and a 20-second deadline across the capture. An oversized source is
+omitted while later smaller sources may still fit. When the deadline expires,
+remaining source reads are skipped. Script metadata, per-item omission reasons,
+and `script_sources` completeness remain available. A single CDP response can
+still be materialized up to the separate 64 MiB transport limit before source
+admission; the retention budget does not bound that transient allocation.
+
+Bundle parsing and semantic inspection run sequentially in an owned child,
+without executing captured code. `max_heap_mb` defaults to 1024 MiB V8
+old-space; `analysis_timeout_ms` defaults to 30000 per script, including startup
+and transfer. A failed or timed-out script becomes an explicit unknown while
+completed findings and later scripts remain available. `total_analysis_timeout_ms`
+defaults to 300000 across script analysis; expiry returns a typed timeout with
+partial Evidence and identifies unstarted scripts. These controls are also
+available as CLI flags with hyphenated names. Capture and optional source-map
+fetching have separate budgets.
+
+One web-bundle capture/analysis is admitted per REA process at a time. Completed
+script results share an 8 MiB serialized transfer budget, with host heap
+reservation checked before decoding and validating another result.
+Exhausted result capacity stops further script launches and returns a typed
+resource failure with completed facts and explicit unstarted-script unknowns.
+Worker control frames are limited to 64 KiB. Cleanup must confirm child termination
+before releasing its private files; failed cleanup retains its exact owner and
+blocks replacement until retry succeeds. Cancellation retains completed bundle
+facts, including cancellation during final cleanup.
+
+The worker heap setting is not a process-family RSS limit. Node enforces V8
+old-space flags; Bun ignores them. Windows Bun instead uses an owned process
+commit limit with a 512 MiB runtime reserve; other Bun hosts have no enforced
+memory limit. These bounds do not establish an aggregate host-memory limit
+across other REA operations or external processes.
+
 Resource-tree inventories distinguish a valid empty `resources` array from a
 missing or malformed collection. Invalid resource entries are omitted with
 incomplete coverage, while valid resources from that frame and other frames