docs: search-index lock-acquisition order and threading model (#138) #316

Job	Run time
Verify prod requirements.txt is sufficient	7s
ruff + pip-audit (windows-latest)	1m 2s
API integration tests + coverage (windows-latest)	57s
pytest (macos-latest)	1m 5s
mypy	23s
ruff + pip-audit (ubuntu-latest)	20s
Performance benchmarks (gated)	31s
pytest (ubuntu-latest)	49s
API integration tests + coverage (ubuntu-latest)	18s
pytest (windows-latest)	1m 42s
ruff + pip-audit (macos-latest)	28s
API integration tests + coverage (macos-latest)	23s
Frontend unit tests (vitest) (macos-latest)	26s
Frontend unit tests (vitest) (windows-latest)	46s
Frontend unit tests (vitest) (ubuntu-latest)	29s
	9m 46s

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