Merge branch 'master' into feat/issue-727-pr-sync-status

Resolve task_capability_map conflict by keeping PR-sync entries and #725
merger-lease map entries. Fix author ownership for PR #728 (issue #727):
prove lock via linked issue/session/branch instead of issue_number==pr_number.
Add regression tests for 727/728 ownership and unrelated issue rejection.

task_capability_map.py

@@ -125,6 +125,18 @@ TASK_CAPABILITY_MAP: dict[str, dict[str, str]] = {
         "permission": "gitea.pr.comment",
         "role": "merger",
     },
+    "gitea_adopt_merger_pr_lease": {
+        "permission": "gitea.pr.comment",
+        "role": "merger",
+    },
+    "acquire_merger_pr_lease": {
+        "permission": "gitea.pr.comment",
+        "role": "merger",
+    },
+    "gitea_acquire_merger_pr_lease": {
+        "permission": "gitea.pr.comment",
+        "role": "merger",
+    },
     # #691: guarded non-owner cleanup of obsolete comment-backed reviewer leases.
     # Apply path posts lease release + audit comments (gitea.pr.comment).
     "cleanup_obsolete_reviewer_comment_lease": {