test: reset preflight globals in read-survival setUp (#469)

Prevents cross-test leakage that masked the missing-capability fail-closed case.

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

tests/test_preflight_read_survival.py

@@ -21,7 +21,15 @@ class TestPreflightReadSurvival(unittest.TestCase):
             if key in os.environ:
                 del os.environ[key]
         os.environ["GITEA_TEST_PORCELAIN"] = ""
+        mcp_server._preflight_whoami_called = False
+        mcp_server._preflight_capability_called = False
+        mcp_server._preflight_whoami_violation = False
+        mcp_server._preflight_capability_violation = False
+        mcp_server._preflight_resolved_role = None
+        mcp_server._preflight_resolved_task = None
         mcp_server._process_start_porcelain = ""
+        mcp_server._preflight_whoami_baseline_porcelain = None
+        mcp_server._preflight_capability_baseline_porcelain = None
 
     def tearDown(self):
         mcp_server._preflight_whoami_called = self.orig_whoami