claude-code-chat-browser: SessionMetadataDict — tighten all-NotRequired fields for mypy shape enforcement #234

Job	Run time
pytest (ubuntu-latest)	43s
mypy	18s
Frontend unit tests (vitest) (windows-latest)	48s
pytest (windows-latest)	1m 10s
Verify prod requirements.txt is sufficient	14s
API integration tests + coverage (ubuntu-latest)	18s
ruff + pip-audit (windows-latest)	1m 12s
Frontend unit tests (vitest) (ubuntu-latest)	22s
API integration tests + coverage (macos-latest)	25s
Performance benchmarks (gated)	30s
Frontend unit tests (vitest) (macos-latest)	27s
pytest (macos-latest)	28s
ruff + pip-audit (ubuntu-latest)	24s
API integration tests + coverage (windows-latest)	45s
ruff + pip-audit (macos-latest)	22s
	8m 26s

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