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TTX 0.5.1 replaces legacy graph retention with synchronous transactional observation and adds Selection for provider-owned, consumer-context visitation. Stateful ownership and release now belong to typed contracts, while None is the Constant closed graph dead end.
This release also adds the Simulacra architecture reference, strengthens graph observation invariants, makes AMD64 canonical-form fixtures explicit, and restores Web validation.
The Graph ABI changed from 0.5.0. Providers and consumers must upgrade together.