827f215115
---ci--- project: orca phase: 10 milestone: v0.12 status: execute ---/ci--- Migration 0008: add prev_hash + entry_hash columns + append-only triggers (UPDATE/DELETE blocked with ABORT). audit_repo.go: Append computes hash chain (sha256(prev_hash || timestamp || actor || action || resource || result || error || metadata)). VerifyChain recomputes from first entry, detects tampering. 2 new tests: VerifyChain (5-entry chain verifies), TamperDetection (UPDATE + DELETE blocked by trigger). All store tests pass.