fix(test): use retry cleanup in antigravity e2e to prevent ENOTEMPTY flake

[magyargergo]

Replace bare fsp.rm / fs.rmSync in antigravity-hook-e2e.test.ts afterAll with the existing cleanupTempDir / cleanupTempDirSync helpers from test/helpers/test-db.ts which retry with exponential backoff on transient filesystem errors.

Also extend shouldSwallowCleanupError to swallow ENOTEMPTY on all platforms (was Windows-only). The CI failure on macOS was ENOTEMPTY on a deeply nested node-gyp cache directory inside the temp HOME — a cleanup-time race that retries usually resolve, but the final attempt must not crash the test suite if the race persists.

Changes

• antigravity-hook-e2e.test.ts: import and use cleanupTempDir/cleanupTempDirSync instead of bare fsp.rm/fs.rmSync
• test/helpers/test-db.ts: swallow ENOTEMPTY on all platforms after retry exhaustion

Test plan

• Existing antigravity e2e tests still pass locally
• The ENOTEMPTY error from CI run would be retried then swallowed

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Project	Deployment	Actions	Updated (UTC)
gitnexus	Ready	Preview, Comment	May 26, 2026 2:13pm

[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
9886	9883	0	3	614s

✅ All 9883 tests passed

3 test(s) skipped — expand for details

• PHP pipeline benchmark > scales with file count (workers enabled)
• Rust pipeline benchmark > scales with file count (workers enabled)
• 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	79.87%	34057/42639	N/A%	—	🟢 ███████████████░░░░░
Branches	68.46%	21781/31814	N/A%	—	🟢 █████████████░░░░░░░
Functions	84.81%	3524/4155	N/A%	—	🟢 ████████████████░░░░
Lines	83.34%	30676/36805	N/A%	—	🟢 ████████████████░░░░

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