fix(feishu): tolerate malformed dedup timestamps

Salvages @Es1la's PR #13632 — a non-numeric timestamp in the persisted
feishu dedup state crashed adapter startup with ValueError/TypeError
from the unguarded float() call. Wrap the float() conversion in
try/except; skip the bad key and keep loading the rest.

The original PR also restructured existing TestDedupTTL tests to use
tempfile.TemporaryDirectory + HERMES_HOME patching — that was
test-hygiene scope creep unrelated to the bug. Kept only the
malformed-timestamp fix and added a focused regression test.

gateway/platforms/feishu.py

@@ -3953,7 +3953,14 @@ class FeishuAdapter(BasePlatformAdapter):
         if isinstance(seen_data, list):
             entries: Dict[str, float] = {str(item).strip(): 0.0 for item in seen_data if str(item).strip()}
         elif isinstance(seen_data, dict):
-            entries = {k: float(v) for k, v in seen_data.items() if isinstance(k, str) and k.strip()}
+            entries = {}
+            for key, value in seen_data.items():
+                if not isinstance(key, str) or not key.strip():
+                    continue
+                try:
+                    entries[key] = float(value)
+                except (TypeError, ValueError):
+                    continue
         else:
             return
         # Filter out TTL-expired entries (entries saved with ts=0.0 are treated as immortal

tests/gateway/test_feishu.py

@@ -3197,6 +3197,37 @@ class TestDedupTTL(unittest.TestCase):
         with patch.object(adapter, "_persist_seen_message_ids"):
             self.assertFalse(adapter._is_duplicate("om_old"))
 
+    @patch.dict(os.environ, {}, clear=True)
+    def test_load_tolerates_malformed_timestamp_values(self):
+        """Regression #13632 — a non-numeric timestamp in the persisted
+        dedup state must not crash adapter startup.  The bad key is
+        skipped; the rest of the state loads.
+        """
+        import tempfile
+        from gateway.config import PlatformConfig
+        from gateway.platforms.feishu import FeishuAdapter
+
+        with tempfile.TemporaryDirectory() as temp_home:
+            with patch.dict(os.environ, {"HERMES_HOME": temp_home}, clear=True):
+                adapter = FeishuAdapter(PlatformConfig())
+                adapter._dedup_state_path.parent.mkdir(parents=True, exist_ok=True)
+                adapter._dedup_state_path.write_text(
+                    json.dumps(
+                        {
+                            "message_ids": {
+                                "om_good": time.time(),
+                                "om_bad_str": "not-a-timestamp",
+                                "om_bad_null": None,
+                            }
+                        }
+                    ),
+                    encoding="utf-8",
+                )
+                adapter._load_seen_message_ids()
+                assert "om_good" in adapter._seen_message_ids
+                assert "om_bad_str" not in adapter._seen_message_ids
+                assert "om_bad_null" not in adapter._seen_message_ids
+
     @patch.dict(os.environ, {}, clear=True)
     def test_persist_saves_timestamps_as_dict(self):
         from gateway.config import PlatformConfig