feat: enforce author work leases (Closes #267)

docs/wiki/Workflow.md

@@ -17,6 +17,10 @@
 0. Work Selection Rule — verify a work lease before any mutations (open PRs,
    issue-linked PRs, branches, worktrees, dirty worktrees, active leases/
    handoffs, merged-PR completion). Stop if another session owns the lease.
+   `gitea_lock_issue` records an operation-scoped `author_issue_work` lease
+   with issue, branch, worktree, claimant, created, expiry, and heartbeat
+   fields; active or expired same-operation leases require recovery review
+   before takeover.
 0b. Global LLM Worktree Rule — main checkout on `master`/`main`/`dev` only;
    mutate only from a `branches/` worktree after proving root, cwd, branch,
    stable main-checkout branch, and session worktree path (no exceptions).
@@ -31,4 +35,4 @@
 Wiki publication, credential provisioning, and cross-repo mirror operations are
 operator-confirmed actions — see [Runbooks](Runbooks.md).
 
-Full Gitea-specific runbooks: `docs/llm-workflow-runbooks.md` in the repository.
+Full Gitea-specific runbooks: `docs/llm-workflow-runbooks.md` in the repository.