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feat(security): Attestation v2 and merge poisoning guard - #382
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Why: W27-1/W27-3. Chains were truncatable and TOFU, and semantic merge could be steered by self-asserted supersession or content inflation. What: - Attestation v2: signed seq/audience/head/key_id; chain rejects gaps, truncation and empty chains; verify pins the key id; `--head`, `--previous`, `--no-head` CLI flags; keygen prints key id. - Merge guard: fingerprint covers verification/project/lineage; strict prefix extension with matching anchors only; untrusted, protected (constraint/ADR/strong verification) and inflation cases conflict. - Tests: sequence/head/truncation/key pinning, inflation attack, protected constraints, verification-only upgrades. Verification: bun test 1523 pass / 0 fail; tsc clean; build 434 modules; secret scan clean. Co-authored-by: CommandCodeBot <noreply@commandcode.ai>
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W27-1/W27-3: signed sequence + terminal head + key-id pinning; semantic merge rejects untrusted/self-asserted lineage, content inflation and protected constraints. Gate 1523/0.