fix(test): widen worker pool retry timeout to prevent CI flake (#1323)

[azizur100389]

Summary

• The replaces a timed-out worker and retries with a longer timeout test used a 150 ms idle timeout (subBatchIdleTimeoutMs: 150), leaving almost no headroom when CI runners are under load.
• Widens the timeout to 500 ms; with the existing timeoutBackoffFactor: 4, the retry fires at 2 000 ms instead of 600 ms, giving the worker time to respond before the assertion window closes.
• Updates the matching assertion from 'Retrying with 0.6s timeout' to 'Retrying with 2s timeout'.

Test plan

• npx vitest run test/integration/worker-pool.test.ts — all 22 tests pass
• No other test uses the same 150 ms value in a way that would be affected

Closes #1323

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[github-actions]

CI Report

✅ All checks passed

Pipeline Status

Stage	Status	Details
✅ Typecheck	success	tsc --noEmit
✅ Tests	success	unit tests, 3 platforms
✅ E2E	success	gitnexus-web changes only

Test Results

Tests	Passed	Failed	Skipped	Duration
8023	8022	0	1	373s

✅ All 8022 tests passed

1 test(s) skipped — expand for details

• buildTypeEnv > known limitations (documented skip tests) > Ruby block parameter: users.each { |user| } — closure param inference, different feature

Code Coverage

Tests

Metric	Coverage	Covered	Base	Delta	Status
Statements	77.6%	24481/31545	77.02%	📈 +0.6	🟢 ███████████████░░░░░
Branches	66.19%	15520/23447	65.97%	📈 +0.2	🟢 █████████████░░░░░░░
Functions	82.81%	2419/2921	81.86%	📈 +1.0	🟢 ████████████████░░░░
Lines	80.63%	22103/27410	79.89%	📈 +0.7	🟢 ████████████████░░░░

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