chore: add warnings to silent except Exception blocks (#3212)

* log(app): add warnings to silent except Exception blocks

- Internal tool auth header failure now logs a warning instead of
  silently passing, making auth bypass easier to spot in logs.
- Token last_used_at update failure now logs at DEBUG (fire-and-forget,
  non-critical, but useful when debugging token tracking issues).
- Image ownership verification failure now logs a warning so unexpected
  access-check errors surface instead of silently allowing the request.

* log(chat_routes): add warnings to silent except Exception blocks

- clear_orphaned_session_endpoint: log before rollback so failures
  appear in traces when users see stale/deleted model options.
- _endpoint_has_model (JSON parse): log malformed cached_models instead
  of silently treating endpoint as valid.
- _has_any_visible_model (JSON parse): log malformed cached_models
  instead of silently returning empty list.
- timezone header parse: log failure so time-zone-related tool bugs
  (wrong scheduled times, calendar events) are traceable.
- attachments JSON parse: log failure so silently-dropped attachments
  are visible in server logs.

* log(email_routes): add warnings to silent except Exception blocks

- Email alias resolution failure now logs a warning instead of silently
  returning an empty list, making broken account configs diagnosable.

* log(document_routes): add warnings to silent except Exception blocks

- Export ZIP request body parse failure now logs a warning so empty
  exports caused by malformed requests are diagnosable.
- clear_active_document failure on detach now logs a warning to help
  trace doc re-injection bugs like #1160.

* log(agent_loop): add warnings to silent except Exception blocks

- builtin tool overrides load failure now logs a warning so misconfigured
  settings don't silently fall back to defaults without a trace.
- Timezone context injection failure now logs a warning to help debug
  incorrect scheduled times in agent-created tasks.
- PDF form-backed document detection failure now logs a warning so
  broken form-doc UI is traceable to the root cause.

* log(llm_core): add warnings to silent except Exception blocks

- Malformed URL in _is_ollama_native_url now logs a warning so bad
  endpoint configs are traceable instead of silently returning False.
- Model list fetch failure now logs a warning with the endpoint URL so
  endpoints that silently vanish from the model picker are diagnosable.

* log: pass exception via exc_info instead of string interpolation

* fix(logging): avoid logging raw URLs in llm_core error paths

Drop the raw url/base_chat_url from the Ollama-detection and
model-list-fetch warning logs added by this sweep, since these values
can contain private hostnames, internal IPs, credentials, or other
deployment details.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

src/agent_loop.py

@@ -524,7 +524,7 @@ def get_builtin_overrides() -> dict:
         ov = get_setting("builtin_tool_overrides", {})
         return ov if isinstance(ov, dict) else {}
     except Exception as e:
-        logger.warning('Failed to load builtin tool overrides: %s', e)
+        logger.warning("Failed to load builtin tool overrides, using defaults", exc_info=e)
         return {}
 
 
@@ -929,8 +929,8 @@ def _build_system_prompt(
     try:
         from src.user_time import current_datetime_context_message
         _datetime_message = current_datetime_context_message()
-    except Exception:
-        pass
+    except Exception as e:
+        logger.warning("Failed to build datetime context message", exc_info=e)
 
     # Document context is kept as a SEPARATE message (not merged into the tool
     # prompt) so the context trimmer doesn't destroy it when truncating the
@@ -973,8 +973,8 @@ def _build_system_prompt(
             try:
                 from src.pdf_form_doc import find_source_upload_id
                 _is_form_backed = bool(find_source_upload_id(active_document.current_content or ""))
-            except Exception:
-                pass
+            except Exception as e:
+                logger.warning("Failed to detect if document is form-backed, assuming plain", exc_info=e)
 
             if _is_form_backed:
                 doc_ctx = (

src/llm_core.py

@@ -283,7 +283,8 @@ def _is_ollama_native_url(url: str) -> bool:
     """Return True for native Ollama API URLs, including Ollama Cloud."""
     try:
         parsed = urlparse(url or "")
-    except Exception:
+    except Exception as e:
+        logger.warning("Failed to parse URL for Ollama detection", exc_info=e)
         return False
     host = parsed.hostname or ""
     path = (parsed.path or "").rstrip("/")
@@ -1345,8 +1346,8 @@ def list_model_ids(
                 r = httpx.get(root + "/api/tags", timeout=timeout)
                 r.raise_for_status()
                 return [m.get("name") or m.get("model") for m in (r.json().get("models") or []) if m.get("name") or m.get("model")]
-        except Exception:
-            pass
+        except Exception as e:
+            logger.warning("Failed to fetch model list from configured endpoint", exc_info=e)
         return []
 
 def normalize_model_id(