test(update): expose detached recovery failure evidence

[lidge-jun]

Summary

Captures the evidence missing from the actual Linux 4/4 update-restart failure in final dev run 33943525788. Only the copied test launcher is instrumented: owner-only temporary files record the detached child output and exit status; readiness failure emits bounded allowlisted categories, source frames and runtime-file presence.

This does not claim a production fix yet. The original assertions, time budgets, real restart and teardown are unchanged. Raw output, tokens and request bodies are not printed.

Stack: depends on #3622; merge bottom-up, then inspect the final dev run.

Verification

• Worker static validation passed; no local tests or launcher execution.
• Exact failure evidence: job 101246770910, waitForProxy false after 91,864.70 ms.
• Production bin/ocx.mjs is unchanged; instrumentation applies only to the fixture copy.
• Next hosted dev CI must either pass or supply the missing failure evidence.

Checklist

• Diagnostics limited to one existing failing test.
• No timeout inflation, skipped assertions or fake successful server.
• Output and temporary-file permissions bounded.

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-09-05T04:32:05.624624Z	1f62b97	PR opened

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[github-actions]

✅ Deterministic PR hygiene checks passed.