feat: support numbered resume selection in cli and gateway

tests/gateway/test_resume_command.py

@@ -88,6 +88,9 @@ class TestHandleResumeCommand:
         assert "Research" in result
         assert "Coding" in result
         assert "Named Sessions" in result
+        assert "1." in result
+        assert "2." in result
+        assert "/resume 1" in result
         db.close()
 
     @pytest.mark.asyncio
@@ -104,6 +107,47 @@ class TestHandleResumeCommand:
         assert "/title" in result
         db.close()
 
+    @pytest.mark.asyncio
+    async def test_resume_by_index(self, tmp_path):
+        """Numeric argument resumes the indexed titled session from the list."""
+        from hermes_state import SessionDB
+        db = SessionDB(db_path=tmp_path / "state.db")
+        db.create_session("sess_001", "telegram")
+        db.create_session("sess_002", "telegram")
+        db.set_session_title("sess_001", "Research")
+        db.set_session_title("sess_002", "Coding")
+        db.create_session("current_session_001", "telegram")
+
+        event = _make_event(text="/resume 2")
+        runner = _make_runner(session_db=db, current_session_id="current_session_001",
+                              event=event)
+        result = await runner._handle_resume_command(event)
+
+        assert "Resumed" in result
+        runner.session_store.switch_session.assert_called_once()
+        call_args = runner.session_store.switch_session.call_args
+        assert call_args[0][1] == "sess_001"
+        db.close()
+
+    @pytest.mark.asyncio
+    async def test_resume_index_out_of_range(self, tmp_path):
+        """Out-of-range numeric arguments show a helpful error."""
+        from hermes_state import SessionDB
+        db = SessionDB(db_path=tmp_path / "state.db")
+        db.create_session("sess_001", "telegram")
+        db.set_session_title("sess_001", "Research")
+        db.create_session("current_session_001", "telegram")
+
+        event = _make_event(text="/resume 9")
+        runner = _make_runner(session_db=db, current_session_id="current_session_001",
+                              event=event)
+        result = await runner._handle_resume_command(event)
+
+        assert "out of range" in result.lower()
+        assert "/resume" in result
+        runner.session_store.switch_session.assert_not_called()
+        db.close()
+
     @pytest.mark.asyncio
     async def test_resume_by_name(self, tmp_path):
         """Resolves a title and switches to that session."""