docs: search-index lock-acquisition order and threading model #315

Job	Run time
Frontend unit tests (vitest) (windows-latest)	1m 2s
ruff + pip-audit (ubuntu-latest)	21s
mypy	20s
Verify prod requirements.txt is sufficient	9s
API integration tests + coverage (macos-latest)	17s
API integration tests + coverage (ubuntu-latest)	22s
Performance benchmarks (gated)	37s
pytest (ubuntu-latest)	56s
Frontend unit tests (vitest) (macos-latest)	42s
Frontend unit tests (vitest) (ubuntu-latest)	24s
pytest (windows-latest)	1m 31s
API integration tests + coverage (windows-latest)	53s
ruff + pip-audit (macos-latest)	31s
pytest (macos-latest)	45s
ruff + pip-audit (windows-latest)	1m 8s
	9m 58s

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