Session list performance: disk summary cache, display-name cache, and… #248

Job	Run time
pytest (ubuntu-latest)	48s
ruff + pip-audit (macos-latest)	21s
pytest (macos-latest)	46s
ruff + pip-audit (ubuntu-latest)	20s
Performance benchmarks (gated)	28s
Frontend unit tests (vitest) (windows-latest)	59s
Frontend unit tests (vitest) (macos-latest)	31s
Frontend unit tests (vitest) (ubuntu-latest)	18s
mypy	32s
Verify prod requirements.txt is sufficient	8s
pytest (windows-latest)	1m 21s
API integration tests + coverage (ubuntu-latest)	20s
ruff + pip-audit (windows-latest)	1m 30s
API integration tests + coverage (macos-latest)	19s
API integration tests + coverage (windows-latest)	55s
	9m 36s

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