Tests

Tighten Bubble boundary with typed accessors #293

Job	Run time
Secret scan (gitleaks)	7s
Lock file freshness	10s
Typecheck (mypy)	18s
Unit tests (ubuntu-latest / Python 3.10)	25s
Unit tests (macos-latest / Python 3.11)	19s
Unit tests (ubuntu-latest / Python 3.13)	24s
Unit tests (windows-latest / Python 3.12)	1m 32s
Unit tests (macos-latest / Python 3.12)	36s
Unit tests (macos-latest / Python 3.10)	45s
Unit tests (ubuntu-latest / Python 3.11)	25s
Unit tests (ubuntu-latest / Python 3.12)	22s
Unit tests (windows-latest / Python 3.11)	1m 24s
Unit tests (macos-latest / Python 3.13)	24s
Unit tests (windows-latest / Python 3.13)	1m 4s
Unit tests (windows-latest / Python 3.10)	1m 1s
Performance benchmarks (gated)	36s
	9m 52s

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