test: align duplicate gate lock fixtures with #447 provenance (#407)

Rebase onto master (#413/#463) requires sanctioned lock_provenance in
create_pr duplicate-recheck tests.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

tests/test_issue_work_duplicate_gate.py

@@ -9,6 +9,7 @@ from unittest.mock import patch
 
 sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
 
+import issue_lock_provenance
 import issue_work_duplicate_gate as dup_gate
 import mcp_server
 from issue_work_duplicate_gate import (
@@ -172,11 +173,23 @@ class TestMcpDuplicateRecheck(unittest.TestCase):
         self._dir.cleanup()
 
     def _write_lock(self, issue_number=400, branch="feat/issue-400-x"):
+        work_lease = {
+            "operation_type": "author_issue_work",
+            "issue_number": issue_number,
+            "branch": branch,
+            "claimant": {"username": "test-user", "profile": "test-author"},
+            "expires_at": "2999-01-01T00:00:00Z",
+        }
         with open(self.lock_path, "w", encoding="utf-8") as fh:
             json.dump({
                 "issue_number": issue_number,
                 "branch_name": branch,
                 "remote": "prgs",
+                "work_lease": work_lease,
+                "lock_provenance": issue_lock_provenance.build_sanctioned_lock_provenance(
+                    tool="gitea_lock_issue",
+                    claimant=work_lease.get("claimant"),
+                ),
             }, fh)
 
     @patch("mcp_server._assess_issue_duplicate_gate")