fix(arch-010): checker scans full app tree by default and handles relative paths

scripts/check_cross_plugin_imports.py

@@ -200,15 +200,10 @@ def find_python_files(search_path: Path | None = None) -> list[Path]:
                     files.append(Path(root) / fname)
         return sorted(files)
 
-    # Default: scan both plugin and core directories
+    # Default: scan the whole app/ tree so new subpackages are covered automatically
     files: list[Path] = []
     scan_dirs = [
-        BUILTINS_DIR,
-        PROJECT_ROOT / "app" / "core",
-        PROJECT_ROOT / "app" / "services",
-        PROJECT_ROOT / "app" / "routes",
-        PROJECT_ROOT / "app" / "commands",
-        PROJECT_ROOT / "app" / "ai",
+        PROJECT_ROOT / "app",
     ]
     for scan_dir in scan_dirs:
         if not scan_dir.exists():
@@ -229,8 +224,8 @@ def main() -> int:
     parser.add_argument(
         "--path",
         type=Path,
-        default=BUILTINS_DIR,
-        help="Path to check (default: app/plugins/builtins)",
+        default=None,
+        help="Path to check (default: full scan of builtins + core dirs)",
     )
     parser.add_argument(
         "--verbose",
@@ -239,6 +234,10 @@ def main() -> int:
     )
     args = parser.parse_args()
 
+    # Resolve user-supplied paths so downstream relative_to(PROJECT_ROOT) works
+    if args.path is not None:
+        args.path = args.path.resolve()
+
     files = find_python_files(args.path)
     all_violations: list[str] = []
     checked = 0