refactor(errors): replace silent exception handling in core packages

artemis/interfaces/cli/commands/doctor.py

@@ -170,7 +170,8 @@ def doctor_command(
                     state = parts[1]
                     extra = " ".join(parts[2:])
                     devices_info.append((serial, state, extra))
-        except Exception:
+        except (OSError, subprocess.SubprocessError):
+            # adb probe failed or timed out; report as "no devices detected".
             pass
 
     if devices_info:

artemis/interfaces/cli/commands/init.py

@@ -78,7 +78,8 @@ def init_command() -> None:
                     serial = parts[0]
                     extra = " ".join(parts[2:])
                     detected_devices.append((serial, extra))
-        except Exception:
+        except (OSError, subprocess.SubprocessError):
+            # adb probe failed or timed out; continue setup with no devices.
             pass
 
     selected_serial = ""

artemis/interfaces/cli/commands/mcp.py

@@ -166,7 +166,8 @@ def _parse_json_lenient(text: str) -> dict | None:
     try:
         data = json.loads(text)
         return data if isinstance(data, dict) else None
-    except Exception:
+    except ValueError:
+        # Not strict JSON; fall through to the lenient JSONC cleanup below.
         pass
     # Remove // single-line comments
     cleaned = re.sub(r"//.*", "", text)
@@ -215,8 +216,11 @@ def _merge_json_file(
                 try:
                     backup_path.write_text(raw_text, encoding="utf-8")
                     logger.warning(f"Existing JSON in {file_path} could not be parsed; backup created at {backup_path}")
-                except Exception:
-                    pass
+                except OSError as exc:
+                    logger.warning(
+                        f"Existing JSON in {file_path} could not be parsed AND the backup to"
+                        f" {backup_path} failed ({exc}); the original content will be overwritten."
+                    )
 
         for remove_path in remove_paths:
             parent = data
@@ -316,8 +320,10 @@ def _merge_codex_toml(file_path: Path, server_config: dict) -> bool:
                 backup_path = file_path.with_suffix(file_path.suffix + ".bak")
                 backup_path.write_text(file_path.read_text(encoding="utf-8"), encoding="utf-8")
                 logger.warning(f"Could not update {file_path}; backup created at {backup_path}: {e}")
-            except Exception:
-                pass
+            except (OSError, UnicodeDecodeError) as backup_exc:
+                logger.warning(
+                    f"Could not update {file_path} ({e}); backup also failed: {backup_exc}"
+                )
         else:
             logger.warning(f"Could not create Codex MCP config file {file_path}: {e}")
         return False
@@ -394,7 +400,8 @@ def _write_rule_file(file_path: Path, content: str) -> bool:
             try:
                 if file_path.read_text(encoding="utf-8") == new_text:
                     return True
-            except Exception:
+            except (OSError, UnicodeDecodeError):
+                # Unreadable existing file: skip the no-op check and rewrite it.
                 pass
         file_path.write_text(new_text, encoding="utf-8")
         return True
@@ -419,7 +426,8 @@ def _write_cursor_mdc(file_path: Path, content: str) -> bool:
             try:
                 if file_path.read_text(encoding="utf-8") == new_text:
                     return True
-            except Exception:
+            except (OSError, UnicodeDecodeError):
+                # Unreadable existing file: skip the no-op check and rewrite it.
                 pass
         file_path.write_text(new_text, encoding="utf-8")
         return True

artemis/interfaces/cli/commands/run.py

@@ -408,8 +408,9 @@ def run_command(
                 host=settings.ADB_HOST or "localhost",
                 port=settings.ADB_PORT or 5037,
             )
-    except Exception:
-        pass
+    except Exception as exc:
+        # Optional cosmetic device-status display; run continues without it.
+        logger.debug(f"Could not create ADB client for device status display: {exc}")
 
     display_device_status(console, adb_client=adb_client)
 
@@ -420,7 +421,9 @@ def run_command(
             original_sigterm = signal.signal(
                 signal.SIGTERM, lambda s, f: (_ for _ in ()).throw(KeyboardInterrupt())
             )
-    except Exception:
+    except (ValueError, OSError, RuntimeError):
+        # Not the main thread or platform does not support SIGTERM handlers;
+        # run proceeds without the graceful-cancel hook.
         pass
 
     try:
@@ -471,7 +474,8 @@ def run_command(
         try:
             if original_sigterm is not None and hasattr(signal, "SIGTERM"):
                 signal.signal(signal.SIGTERM, original_sigterm)
-        except Exception:
+        except (ValueError, OSError, RuntimeError):
+            # Best-effort restore of the previous handler on the way out.
             pass
         if cancelled:
             raise SystemExit(130)

artemis/interfaces/cli/commands/server_lifecycle.py

@@ -265,7 +265,8 @@ def status_command(
             try:
                 dt = datetime.datetime.fromtimestamp(metadata["started_at"])
                 started_at_str = dt.strftime("%Y-%m-%d %H:%M:%S")
-            except Exception:
+            except (TypeError, ValueError, OSError, OverflowError):
+                # Malformed or out-of-range timestamp in metadata: show "Unknown".
                 pass
 
         table = Table(show_header=False, box=None, padding=(0, 2))