Fix metrics timer stats deadlock

[matdev83]

Summary

• ensure metrics timer statistics reuse a new helper so locks are not reacquired
• add a regression test that verifies get_all_timer_stats returns when invoked from another thread

Testing

• python -m pytest

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Codex Task

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📥 Commits

Reviewing files that changed from the base of the PR and between c03159e and f274982.

📒 Files selected for processing (2)

• src/core/services/metrics_service.py (3 hunks)
• tests/unit/core/services/aaa_test_metrics_service.py (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/identify-and-fix-race-conditions

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