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Behaviour Specs

The coded, plain-language specifications behind the test suite. Each behaviour carries a stable BHV code mapped to at least one tagged test, enforced at 100% by the agentic-test-driven traceability audit — so these pages are not a description of what the code happens to do, they are the contract the tests hold it to, written before the tests and before the implementation. PROOF codes record properties the type system guarantees outright: documented here, deliberately never tested.