Tests

Lazy-load chat histories, fast list summaries, and mtime disk cache (… #173

Job	Run time
Lock file freshness	8s
Typecheck (mypy)	22s
Secret scan (gitleaks)	6s
Unit tests (ubuntu-latest / Python 3.10)	25s
Unit tests (windows-latest / Python 3.10)	1m 10s
Unit tests (ubuntu-latest / Python 3.13)	23s
Unit tests (ubuntu-latest / Python 3.11)	20s
Unit tests (windows-latest / Python 3.11)	1m 25s
Unit tests (ubuntu-latest / Python 3.12)	23s
Unit tests (macos-latest / Python 3.13)	19s
Unit tests (windows-latest / Python 3.12)	1m 37s
Unit tests (macos-latest / Python 3.12)	20s
Unit tests (macos-latest / Python 3.11)	28s
Unit tests (windows-latest / Python 3.13)	1m 3s
Unit tests (macos-latest / Python 3.10)	33s
	9m 2s

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