test: add api contract tests#9
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Freeze the public contract so it can't change silently within a major version: - tests/contract/test_surface.py pins __all__ and the exact signature of every exported function. - tests/contract/test_behavior.py freezes documented round-trips, dtypes, errors, the length-prefixed header shape, and the token wire format via a frozen golden token (cross-version decode stability). - CONTRACT.md documents the SemVer promise and the append-only rule for tests/contract/.
Add --doctest-modules so the >>> examples in pl_row_encode's public docstrings execute under pytest. This makes the documented usage a third contract layer (alongside tests/contract/) and guarantees the examples stay runnable. All 6 module doctests pass with no repr brittleness.
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Add api contract, add doctests, freeze api shape