Synchronize executor fixture with process completion

[open-session-os-tella-dev]

Summary

Test-only prerequisite for #444.

• Replace the executor stream test's fixed sleeps with a file handshake between the first and second writes and the existing bounded completion helper.
• Wait for the actual terminal status, not an assumption that the child process has closed after 100 ms.
• Retain every stream identity, sequence, exit-code and terminal replay assertion. Check intermediate batches and accumulated output too, so polling cannot hide lost output.

Only executors/local.test.ts changes. No production behavior, test timeout, or test filtering changes.

Verification

• The original fixture observed running where it expected exited after its fixed delay. Its executor implementation and fixture matched main; the test does not import the rate-limit implementation.
• Focused isolated executor tests: 22 passed, 63 assertions.
• Full OPENSESSION_TEST_JOBS=2 bun run check: formatting, typecheck, compiler/lint, 912 isolated unit-test files, and the strict transcript snapshot file (7 tests, 16 assertions) passed.
• Independent read-only review confirmed the original assertions remain intact.

This uses disposable local child processes only. No deployment or external provider verification is needed for this test-only change.

Started by worker bks-91461095-5061-7e84-8295-b4a5341aced2 (scheduled) in this OS session

[open-session-os-tella-dev]

🤖 OS review · approve · quality 5/5 · risk low

Safe to merge. The test waits on a file handshake and the real exited status instead of fixed sleeps, and every original stream and replay assertion is kept.

🟢 Risk low · recovery in minutes
The change touches only a test file, so a revert leaves no persisted state or delivered output behind.

_{Reviewed f94046c · Opus 5.5 · open session · labels: os-auto-fix fix and push · os-adversarial deeper pass · os-simplify cleanup}

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Project	Deployment	Actions	Updated
opensession	Ready	Preview	Sep 26, 2026 4:18am UTC