feat(provenance): fork-first-class chain model — ADR-0010 (#31; supersedes #32)#109
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…sedes #32) Implements ADR-0010 (now Accepted). The provenance integrity property is tamper-evidence + no-silent-loss, NOT linearity: legitimate divergence (partitioned/replicated/offline writers, simulation branches) must be representable, persisted, detectable and verifiable. Schema - NO `UNIQUE(entity_id, previous_hash)` (#32, superseded): it would reject a divergent writer's honest history at insert time. The `hash` PRIMARY KEY is the correct duplicate guard (domain-tagged preimage). - Add non-unique `idx_provenance_predecessor` → O(log n) fork detection. - `verisimdb_provenance_chain_heads(entity_id, head_hash)` multi-head tip set; legacy single-head table kept one release with an idempotent `INSERT … SELECT` migration (no destructive DROP ships here). Behaviour - `append_provenance`: linear fast-path — extends the unique head; errors (not silently collapses) if the entity has >1 head. - `append_provenance_fork(from_hash)`: extends a specific ancestor, *adds* a head without removing one → the entity now has ≥2 tips. - `fork_points()`: every predecessor with >1 child. - `verify_chain`: per-branch walk (each tip → genesis) so a forked- but-honest entity verifies true while tampering any branch still fails. codegen `overlay.rs` mirrors the schema (harmful `ux_provenance_chain` removed); its DDL tests inverted to assert the ADR-0010 contract. Tests: `tests/provenance_fork_test.rs` rewritten to the 4 ADR-0010 cases (the previously failing-by-design test now passes) + `exact_duplicate_entry_is_rejected`. Full suite green (107 lib + 9 + 4 + 2, 0 failed). ADR-0010 Proposed → Accepted. Closes #31. Supersedes #32 (closed not-planned). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Implements ADR-0010 (Proposed→Accepted). No UNIQUE(entity_id,previous_hash) (#32 superseded; hash PK is the dup guard); non-unique idx_provenance_predecessor; multi-head verisimdb_provenance_chain_heads + idempotent non-destructive migration; append_provenance linear fast-path; append_provenance_fork; fork_points; per-branch verify_chain; overlay.rs mirrored (ux_provenance_chain removed). provenance_fork_test rewritten to the 4 ADR-0010 cases + dup-rejection. Full suite green (107 lib + 9 + 4 + 2). Closes #31; supersedes #32.
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