fix(honcho): describe what _seen_gateway_accounts can list

The docstring said grouping session rows by (source, user_id) enumerates every account the gateway handled. record_gateway_session_peer overwrites a row's user_id, so a shared thread keeps only its last author. The docstring now says that, and a test pins it.

plugins/memory/honcho/cli.py

@@ -1060,8 +1060,8 @@ def _state_db_path() -> Path:
 def _seen_gateway_accounts(db_path: Path) -> list[dict]:
     """Gateway accounts recorded in state.db, most recent first; bot authors are skipped.
 
-    The gateway stamps each session row with its routing peer, so grouping rows by
-    (source, user_id) enumerates every account it has handled.
+    A session row keeps only its last routing peer, so a shared thread contributes
+    its most recent author and not every participant.
     """
     if not db_path.exists():
         return []

tests/honcho_plugin/test_peers_map.py

@@ -51,6 +51,15 @@ class TestSeenGatewayAccounts:
             {"platform": "telegram", "user_id": "111", "user_id_alt": "", "label": "eri", "sessions": 2, "profiles": []},
         ]
 
+    def test_shared_session_lists_only_its_last_author(self, tmp_path):
+        """record_gateway_session_peer overwrites the row's user_id, so earlier authors are gone."""
+        from hermes_state import SessionDB
+
+        db = SessionDB(tmp_path / "state.db")
+        for uid in ("alice", "bob"):
+            db.record_gateway_session_peer("shared", source="telegram", user_id=uid, session_key="telegram:group:1")
+        assert [a["user_id"] for a in _seen_gateway_accounts(tmp_path / "state.db")] == ["bob"]
+
     def test_missing_db_or_table_returns_empty(self, tmp_path):
         assert _seen_gateway_accounts(tmp_path / "absent.db") == []
         sqlite3.connect(tmp_path / "empty.db").close()