Show friendly error when config file not found

Instead of a Python traceback, display a clean error message with
the red ✗ symbol when the config file cannot be found.

src/compose_farm/cli.py

@@ -33,6 +33,15 @@ console = Console(highlight=False)
 err_console = Console(stderr=True, highlight=False)
 
 
+def _load_config_or_exit(config_path: Path | None) -> Config:
+    """Load config or exit with a friendly error message."""
+    try:
+        return load_config(config_path)
+    except FileNotFoundError as e:
+        err_console.print(f"[red]✗[/] {e}")
+        raise typer.Exit(1) from e
+
+
 def _maybe_regenerate_traefik(cfg: Config) -> None:
     """Regenerate traefik config if traefik_file is configured."""
     if cfg.traefik_file is None:
@@ -87,7 +96,7 @@ def _get_services(
     config_path: Path | None,
 ) -> tuple[list[str], Config]:
     """Resolve service list and load config."""
-    config = load_config(config_path)
+    config = _load_config_or_exit(config_path)
 
     if all_services:
         return list(config.services.keys()), config
@@ -262,7 +271,7 @@ def ps(
     config: ConfigOption = None,
 ) -> None:
     """Show status of all services."""
-    cfg = load_config(config)
+    cfg = _load_config_or_exit(config)
     results = _run_async(run_on_services(cfg, list(cfg.services.keys()), "ps"))
     _report_results(results)
 
@@ -370,7 +379,7 @@ def sync(
     file, and captures image digests. Combines service discovery with
     image snapshot into a single command.
     """
-    cfg = load_config(config)
+    cfg = _load_config_or_exit(config)
     current_state = load_state(cfg)
 
     console.print("Discovering running services...")
@@ -416,7 +425,7 @@ def check(
     config: ConfigOption = None,
 ) -> None:
     """Check for compose directories not in config (and vice versa)."""
-    cfg = load_config(config)
+    cfg = _load_config_or_exit(config)
     configured = set(cfg.services.keys())
     on_disk = cfg.discover_compose_dirs()
 
@@ -440,6 +449,20 @@ def check(
         for name in missing_from_config:
             console.print(f"[dim]  {name}: docker-debian[/]")
 
+    # Check traefik labels have matching ports
+    try:
+        _, traefik_warnings = generate_traefik_config(
+            cfg, list(cfg.services.keys()), check_all=True
+        )
+        if traefik_warnings:
+            console.print(f"\n[yellow]Traefik issues[/] ({len(traefik_warnings)}):")
+            for warning in traefik_warnings:
+                console.print(f"  [yellow]![/] {warning}")
+        elif not missing_from_config and not missing_from_disk:
+            console.print("[green]✓[/] All traefik services have published ports.")
+    except (FileNotFoundError, ValueError):
+        pass  # Skip traefik check if config can't be loaded
+
 
 if __name__ == "__main__":
     app()

src/compose_farm/traefik.py

@@ -470,10 +470,19 @@ def _process_service_labels(
 def generate_traefik_config(
     config: Config,
     services: list[str],
+    *,
+    check_all: bool = False,
 ) -> tuple[dict[str, Any], list[str]]:
     """Generate Traefik dynamic config from compose labels.
 
+    Args:
+        config: The compose-farm config.
+        services: List of service names to process.
+        check_all: If True, check all services for warnings (ignore host filtering).
+                   Used by the check command to validate all traefik labels.
+
     Returns (config_dict, warnings).
+
     """
     dynamic: dict[str, Any] = {}
     warnings: list[str] = []
@@ -481,7 +490,7 @@ def generate_traefik_config(
 
     # Determine Traefik's host from service assignment
     traefik_host = None
-    if config.traefik_service:
+    if config.traefik_service and not check_all:
         traefik_host = config.services.get(config.traefik_service)
 
     for stack in services:
@@ -489,10 +498,12 @@ def generate_traefik_config(
         stack_host = config.services.get(stack)
 
         # Skip services on Traefik's host - docker provider handles them directly
-        if host_address.lower() in LOCAL_ADDRESSES:
-            continue
-        if traefik_host and stack_host == traefik_host:
-            continue
+        # (unless check_all is True, for validation purposes)
+        if not check_all:
+            if host_address.lower() in LOCAL_ADDRESSES:
+                continue
+            if traefik_host and stack_host == traefik_host:
+                continue
 
         for compose_service, definition in raw_services.items():
             if not isinstance(definition, dict):