Tests

Lazy-load chat histories, fast list summaries, and mtime disk cache (closes #84) #162

Job	Run time
Lock file freshness	10s
Secret scan (gitleaks)	5s
Unit tests (ubuntu-latest / Python 3.10)	23s
Typecheck (mypy)	23s
Unit tests (macos-latest / Python 3.11)	21s
Unit tests (windows-latest / Python 3.12)	2m 41s
Unit tests (ubuntu-latest / Python 3.13)	24s
Unit tests (macos-latest / Python 3.13)	28s
Unit tests (ubuntu-latest / Python 3.12)	23s
Unit tests (windows-latest / Python 3.11)	51s
Unit tests (ubuntu-latest / Python 3.11)	21s
Unit tests (macos-latest / Python 3.12)	19s
Unit tests (macos-latest / Python 3.10)	45s
Unit tests (windows-latest / Python 3.10)	1m 8s
Unit tests (windows-latest / Python 3.13)	1m 53s
	10m 35s

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