Derive frontmatter and task-block depends_on edges from the pinned commit and
reconcile workplan_dependencies under an explicit ownership contract: only
forge:<repo> rows are created or removed, external relations are preserved,
missing/ambiguous/self targets are recorded and hold owned edges, failures
roll back, and repeat receipts are noop. Additive migration b3c4d5e6f7a8.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 671493@bnt-lap001
Assistant-Session: 60d7b11f-78f9-4731-9367-918511b2762d
