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/timmy/tools_intro/__init__.py

@@ -89,7 +89,8 @@ def _get_ollama_model() -> str:
                 name = model.get("name", "")
                 if name == configured or name == f"{configured}:latest":
                     return configured
-    except Exception:
+    except Exception as exc:
+        logger.debug("Model validation failed: %s", exc)
         pass
 
     # Fallback to configured model
@@ -186,7 +187,8 @@ def get_memory_status() -> dict[str, Any]:
                 tier3_info["available"] = True
                 tier3_info["vector_count"] = count[0] if count else 0
             conn.close()
-    except Exception:
+    except Exception as exc:
+        logger.debug("Memory status query failed: %s", exc)
         pass
 
     # Self-coding journal stats
@@ -212,7 +214,8 @@ def get_memory_status() -> dict[str, Any]:
                     "success_rate": round(counts.get("success", 0) / total, 2) if total else 0,
                 }
             conn.close()
-    except Exception:
+    except Exception as exc:
+        logger.debug("Journal stats query failed: %s", exc)
         pass
 
     return {
@@ -303,7 +306,8 @@ def get_live_system_status() -> dict[str, Any]:
 
         uptime = (datetime.now(UTC) - _START_TIME).total_seconds()
         result["uptime_seconds"] = int(uptime)
-    except Exception:
+    except Exception as exc:
+        logger.debug("Uptime calculation failed: %s", exc)
         result["uptime_seconds"] = None
 
     # Discord status
@@ -311,7 +315,8 @@ def get_live_system_status() -> dict[str, Any]:
         from integrations.chat_bridge.vendors.discord import discord_bot
 
         result["discord"] = {"state": discord_bot.state.name}
-    except Exception:
+    except Exception as exc:
+        logger.debug("Discord status check failed: %s", exc)
         result["discord"] = {"state": "unknown"}
 
     result["timestamp"] = datetime.now(UTC).isoformat()