test+docs: property-test the core guarantees; add Guarantees page#18
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Prove the claims the event-log architecture rests on — by generating random event sequences with Hypothesis and asserting the invariants, not by example. - tests/test_invariants.py: four property tests — append-only history, deterministic content-addressed snapshots (tamper-evident), newest-first ordering, and point-in-time reconstruction. - docs/concepts/guarantees.md: states each contract precisely and names the test that enforces it — docs and tests cite each other. Includes an honest scope note (snapshots are content-addressed individually, not yet a chained Merkle hash — a deliberate future change, not an accidental gap). - pyproject: add hypothesis to the dev extra (runs in CI). 725 passed / 23 skipped, coverage 74.50%. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Make the system prove its own claims — the rigor signal.
hypothesisadded to the dev extra, so the invariants run in CI.If a future SDK change broke a guarantee, the build would fail before it shipped. 725 passed / 23 skipped, coverage 74.50%.
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