feat: gate reviewer mutations on canonical workflow load proof (Closes #389)

Add gitea_load_review_workflow and in-process session proof required before
gitea_submit_pr_review, gitea_mark_final_review_decision, and gitea_merge_pr.
Capability and runtime context report workflow-load status; stale or missing
proof fails closed with recovery handoff text that forbids approve/merge replay.

tests/test_mcp_server.py

@@ -55,6 +55,12 @@ _NO_BLOCKER_FEEDBACK = {
 }
 
 
+def _init_reviewer_session(remote="prgs"):
+    """Seed review decision lock and required workflow-load proof (#389)."""
+    init_review_decision_lock(remote, "review_pr")
+    mcp_server.gitea_load_review_workflow()
+
+
 def _mark_request_changes_ready(pr_number=8, **kwargs):
     """Mark a request_changes decision ready with the #332 duplicate-
     suppression feedback fetch stubbed to 'no existing blocker'."""
@@ -539,6 +545,9 @@ class TestViewPR(unittest.TestCase):
 class TestMergePR(unittest.TestCase):
     """Gated merge workflow (#16). gitea_merge_pr is the only merge path."""
 
+    def setUp(self):
+        mcp_server.gitea_load_review_workflow()
+
     def _pr(self, author, state="open", sha="abc123", mergeable=True):
         return {
             "user": {"login": author},
@@ -1011,8 +1020,7 @@ class TestReviewPR(unittest.TestCase):
             {"login": "jcwalker3"}, # /api/v1/user (submit eligibility)
             {"user": {"login": "jcwalker3"}, "state": "open", "head": {"sha": "abc1234"}, "mergeable": True}, # /pulls/1
         ]
-        from mcp_server import init_review_decision_lock
-        init_review_decision_lock("prgs", "review_pr")
+        _init_reviewer_session("prgs")
         gitea_mark_final_review_decision(1, "approve", remote="prgs")
         result = gitea_review_pr(
             pr_number=1,
@@ -1680,7 +1688,7 @@ class TestReviewDecisionValidationGate(unittest.TestCase):
         }
 
     def setUp(self):
-        init_review_decision_lock("prgs", "review_pr")
+        _init_reviewer_session("prgs")
 
     def _env(self):
         return patch.dict(os.environ, {
@@ -1775,7 +1783,7 @@ class TestSubmitPrReview(unittest.TestCase):
     """Gated review-mutation tool (#15)."""
 
     def setUp(self):
-        init_review_decision_lock("prgs", "review_pr")
+        _init_reviewer_session("prgs")
         gitea_mark_final_review_decision(8, "approve", remote="prgs")
 
     def _pr(self, author, state="open", sha="abc123", mergeable=True):
@@ -2168,7 +2176,7 @@ class TestSubmitPrReview(unittest.TestCase):
                 os.remove(spoof_path)
 
     def test_mark_final_decision_rejects_remote_mismatch(self):
-        init_review_decision_lock("prgs", "review_pr")
+        _init_reviewer_session("prgs")
         r = gitea_mark_final_review_decision(8, "approve", remote="dadeschools")
         self.assertFalse(r["marked_ready"])
         self.assertTrue(any("does not match locked remote" in x for x in r["reasons"]))
@@ -2250,6 +2258,7 @@ if __name__ == "__main__":
 class TestTrackerHygieneCleanup(unittest.TestCase):
 
     def setUp(self):
+        mcp_server.gitea_load_review_workflow()
         self.mock_api = patch("mcp_server.api_request").start()
         self.mock_auth = patch("mcp_server.get_auth_header", return_value=FAKE_AUTH).start()
         patch("gitea_audit.audit_enabled", return_value=True).start()