Adds structured issue-branch ownership parsing, wires it into lock adoption
and gitea_lock_issue validation, documents the restart recovery workflow, and
adds regression tests for adoption, durable create_pr resolution, and open-PR
blocking without remote branch deletion.
Built on keyed persistent lock store and own-branch adoption (#443 / #442).
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
sysadmin
