Extract issue_work_duplicate_gate for open PR, remote branch, and active
claim checks; wire it into lock_issue, commit_files recheck, and create_pr
recheck. Add gitea_assess_work_issue_duplicate read-only preflight, work-issue
report outcome validation, and workflow section 10A.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
