Session list performance: disk summary cache, display-name cache, and count alignment #244

Job	Run time
ruff + pip-audit (ubuntu-latest)	18s
Frontend unit tests (vitest) (ubuntu-latest)	22s
pytest (macos-latest)	31s
API integration tests + coverage (ubuntu-latest)	24s
Frontend unit tests (vitest) (macos-latest)	20s
Frontend unit tests (vitest) (windows-latest)	48s
API integration tests + coverage (windows-latest)	51s
API integration tests + coverage (macos-latest)	16s
pytest (ubuntu-latest)	38s
Performance benchmarks (gated)	36s
ruff + pip-audit (windows-latest)	1m 0s
pytest (windows-latest)	1m 16s
mypy	23s
ruff + pip-audit (macos-latest)	19s
Verify prod requirements.txt is sufficient	6s
	8m 8s

Provide feedback