fix(kuna): name the setting that owns a timed-out Kuna run (#4343)

* fix(kuna): name the setting that owns a timed-out Kuna run

A Kuna run past its deadline surfaced the generic "Analysis took too
long. Try a smaller request" message. The request is already one
function or one whole-program scan, and the same run takes as long
again, so the advice was wrong and REA_KUNA_TIMEOUT_MS or
REA_KUNA_PROJECT_TIMEOUT_MS was never mentioned.

Each Kuna command now carries a KunaDeadline: the configured
milliseconds and the setting that owns them, from KunaConfiguration.
A timeout reports, for example, "kuna decompile did not finish within
REA_KUNA_TIMEOUT_MS (120000 ms)." Its remediation says to raise that
setting and restart REA, and for a single-function decompile that the
session's project export can still answer. AnalysisTimeoutError now
accepts a producer message and remediation, which projection uses and
per-waiter scan errors keep.

Refs #1957

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* docs(kuna): scope the provider_timeout statement to direct Kuna runs

A timed-out project export is reported through the export failure as
capability_unavailable, not provider_timeout.

Refs #1957

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(kuna): verify native xrefs under the project deadline

The provider's xrefs scan runs under REA_KUNA_PROJECT_TIMEOUT_MS, but the
native oracle in verify:kuna aborted at REA_KUNA_TIMEOUT_MS. A scan that
fit the project deadline but not the function deadline failed
verification although the provider answered it. Use the same deadline.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

docs/kuna-provider.md

@@ -22,6 +22,8 @@ Select it explicitly with `--provider kuna`, MCP's `open_binary.provider_id: "ku
 | `REA_KUNA_TIMEOUT_MS`         | 120 s                                                                                                                                   | Deadline for one single-function decompile, and for the inventory run REA makes when the export ends without one.                                                                        |
 | `REA_KUNA_JOBS`               | 1                                                                                                                                       | `decompile-project --jobs`. 1 is Kuna's reference answer; more jobs finish sooner but lose callee-first prototypes, and change about 40–60% of function bodies on the measured binaries. |
 
+A single-function decompile, inventory, string, graph or xref run that exceeds its deadline fails as `provider_timeout`, naming the setting that owns the deadline and that raising it takes a restart. A project export that exceeds `REA_KUNA_PROJECT_TIMEOUT_MS` is an export failure instead: requests that need the export report `capability_unavailable` with the export's own retry guidance.
+
 Windows is not supported yet. Supported targets are ELF and thin Mach-O executables for x86-64, AArch64 and ARM; PE and universal Mach-O are rejected with a typed reason.
 
 ## What Kuna answers