fix: properly await worker teardown in integration tests to prevent open handles

[phoenix-server]

Summary

• AfterAll was calling worker.close(callback) without awaiting it, so Cucumber resolved the hook immediately while the HTTP server, Redis client, and DB connections remained open
• Node.js would then hang indefinitely waiting for those handles to close, causing integration tests to never exit
• Fixed by wrapping worker.close() in a Promise so AfterAll properly waits for all connections to be torn down before the process exits

Root cause

worker.close() is callback-based (like http.Server.close()). Inside an async function, calling it without wrapping in a Promise means the function returns immediately — the callback never blocks the hook from completing.

Test plan

• Run npm run docker:test:integration and confirm tests exit cleanly without hanging
• Confirm no open handle warnings from Node.js after test run

🤖 Generated with Claude Code

[coveralls]

Coverage Report for CI Build 24596779791

Coverage decreased (-0.3%) to 48.812%

Details

• Coverage decreased (-0.3%) from the base build.
• Patch coverage: 2 uncovered changes across 1 file (6 of 8 lines covered, 75.0%).
• 8 coverage regressions across 2 files.

Uncovered Changes

File	Changed	Covered	%
src/cache/client.ts	4	2	50.0%

Coverage Regressions

8 previously-covered lines in 2 files lost coverage.

File	Lines Losing Coverage	Coverage
src/cache/client.ts	6	40.91%
src/app/worker.ts	2	55.26%

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Coverage Stats

Relevant Lines:	2633
Covered Lines:	1338
Line Coverage:	50.82%
Relevant Branches:	1071
Covered Branches:	470
Branch Coverage:	43.88%
Branches in Coverage %:	Yes
Coverage Strength:	9.53 hits per line

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💛 - Coveralls