fix: log exceptions instead of silently swallowing in cron scheduler

Two 'except Exception: pass' blocks silently hide failures:
- mirror_to_session failure: user's message never gets mirrored, no trace
- config.yaml parse failure: wrong model used silently

Replace with logger.warning so failures are visible in logs.

tests/cron/test_scheduler.py

@@ -1,8 +1,12 @@
-"""Tests for cron/scheduler.py — origin resolution and delivery routing."""
+"""Tests for cron/scheduler.py — origin resolution, delivery routing, and error logging."""
+
+import asyncio
+import logging
+from unittest.mock import patch, MagicMock, AsyncMock
 
 import pytest
 
-from cron.scheduler import _resolve_origin
+from cron.scheduler import _resolve_origin, _deliver_result, run_job
 
 
 class TestResolveOrigin:
@@ -36,3 +40,63 @@ class TestResolveOrigin:
     def test_empty_origin(self):
         job = {"origin": {}}
         assert _resolve_origin(job) is None
+
+
+class TestDeliverResultMirrorLogging:
+    """Verify that mirror_to_session failures are logged, not silently swallowed."""
+
+    def test_mirror_failure_is_logged(self, caplog):
+        """When mirror_to_session raises, a warning should be logged."""
+        from gateway.config import Platform
+
+        pconfig = MagicMock()
+        pconfig.enabled = True
+        mock_cfg = MagicMock()
+        mock_cfg.platforms = {Platform.TELEGRAM: pconfig}
+
+        async def fake_send(*args, **kwargs):
+            return None
+
+        with patch("gateway.config.load_gateway_config", return_value=mock_cfg), \
+             patch("tools.send_message_tool._send_to_platform", new=fake_send), \
+             patch("gateway.mirror.mirror_to_session", side_effect=ConnectionError("network down")):
+            job = {
+                "id": "test-job",
+                "deliver": "origin",
+                "origin": {"platform": "telegram", "chat_id": "123"},
+            }
+            with caplog.at_level(logging.WARNING, logger="cron.scheduler"):
+                _deliver_result(job, "Hello!")
+
+        assert any("mirror_to_session failed" in r.message for r in caplog.records), \
+            f"Expected 'mirror_to_session failed' warning in logs, got: {[r.message for r in caplog.records]}"
+
+
+class TestRunJobConfigLogging:
+    """Verify that config.yaml parse failures are logged, not silently swallowed."""
+
+    def test_bad_config_yaml_is_logged(self, caplog, tmp_path):
+        """When config.yaml is malformed, a warning should be logged."""
+        # Create a bad config.yaml
+        bad_yaml = tmp_path / "config.yaml"
+        bad_yaml.write_text("invalid: yaml: [[[bad")
+
+        job = {
+            "id": "test-job",
+            "name": "test",
+            "prompt": "hello",
+        }
+
+        with patch("cron.scheduler._hermes_home", tmp_path), \
+             patch("cron.scheduler._resolve_origin", return_value=None), \
+             patch("dotenv.load_dotenv"), \
+             patch("run_agent.AIAgent") as mock_agent_cls:
+            mock_agent = MagicMock()
+            mock_agent.run.return_value = ("output doc", "final response")
+            mock_agent_cls.return_value = mock_agent
+
+            with caplog.at_level(logging.WARNING, logger="cron.scheduler"):
+                run_job(job)
+
+        assert any("failed to load config.yaml" in r.message for r in caplog.records), \
+            f"Expected 'failed to load config.yaml' warning in logs, got: {[r.message for r in caplog.records]}"