fix: align test mocks with #399 lease gates and head SHA requirements

PR #416 introduced pr_work_lease reviewer blocks and mandatory full
40-hex expected_head_sha on mark/merge paths. Update audit, review,
permission-report, terminal hard-stop, inventory, and schema tests to
patch lease comment fetches, seed ready review decisions, and use
consistent HEAD_SHA constants so the full suite passes again.

tests/test_permission_reports.py

@@ -230,7 +230,9 @@ class TestEligibilityDenialReport(PermissionReportBase):
             return PR_PAYLOAD
         mock_api.side_effect = fake_api
         mcp_server.init_review_decision_lock("prgs", "review_pr")
-        mcp_server.gitea_mark_final_review_decision(42, "approve", remote="prgs")
+        from tests.test_mcp_server import _seed_ready_review_decision
+
+        _seed_ready_review_decision(42, "approve", remote="prgs")
         with patch.dict(os.environ, self._env("author-profile")):
             res = mcp_server.gitea_submit_pr_review(
                 pr_number=42, action="approve", body="lgtm", remote="prgs",
@@ -272,7 +274,9 @@ class TestReviewCommentPathUsesCanonicalOp(PermissionReportBase):
             return PR_PAYLOAD
         mock_api.side_effect = fake_api
         mcp_server.init_review_decision_lock("prgs", "review_pr")
-        mcp_server.gitea_mark_final_review_decision(42, "comment", remote="prgs")
+        from tests.test_mcp_server import _seed_ready_review_decision
+
+        _seed_ready_review_decision(42, "comment", remote="prgs")
         with patch.dict(os.environ, self._env("author-profile")):
             res = mcp_server.gitea_submit_pr_review(
                 pr_number=42, action="comment", body="finding", remote="prgs",