fix: replace 59 bare except clauses with proper logging (#25)

All `except Exception:` now catch as `except Exception as exc:` with
appropriate logging (warning for critical paths, debug for graceful degradation).

Added logger setup to 4 files that lacked it:
- src/timmy/memory/vector_store.py
- src/dashboard/middleware/csrf.py
- src/dashboard/middleware/security_headers.py
- src/spark/memory.py

31 files changed across timmy core, dashboard, infrastructure, integrations.
Zero bare excepts remain. 1340 tests passing.

src/dashboard/middleware/request_logging.py

@@ -115,7 +115,8 @@ class RequestLoggingMiddleware(BaseHTTPMiddleware):
                         "duration_ms": f"{duration_ms:.0f}",
                     },
                 )
-            except Exception:
+            except Exception as exc:
+                logger.debug("Escalation logging error: %s", exc)
                 pass  # never let escalation break the request
 
             # Re-raise the exception