feat: enforce author work leases (Closes #267)

docs/llm-workflow-runbooks.md

@@ -254,7 +254,20 @@ Never create a parallel branch or PR for the same issue unless the old branch
 is proven abandoned and the takeover is recorded.
 
 Gitea-Tools lease gates: `gitea_lock_issue` (fail-closed before author
-mutations), `status:in-progress`, and claim comments. Full portable wording:
+mutations), `status:in-progress`, and claim comments. `gitea_lock_issue`
+records an `author_issue_work` lease in the issue-lock payload with issue
+number, optional PR number, branch, worktree path, claimant identity/profile,
+created timestamp, expiry timestamp, and last heartbeat timestamp. An active
+same-issue/same-operation lease blocks duplicate work. An expired lease still
+blocks takeover until a recovery review records why the prior work is abandoned,
+completed, or unsafe to continue.
+
+Remote branches matching the issue number are also treated as active work unless
+the recovery review proves the branch is abandoned or superseded. Never delete
+or clean up a branch when it has an active lease, dirty worktree, open PR, or is
+the only copy of unmerged work.
+
+Full portable wording:
 [`skills/llm-project-workflow/SKILL.md`](../skills/llm-project-workflow/SKILL.md).
 
 ## Global LLM Worktree Rule