fix: accept -p and -t in every tool

verify, generate_pack and cross_reference took -p and -t, slots, generate_truth, diff_truth, export_native and refresh_data_dirs refused them. A test reads every add_argument call.

scripts/generate_truth.py

@@ -43,7 +43,7 @@ def parse_args(argv: list[str] | None = None) -> argparse.Namespace:
     )
     group = parser.add_mutually_exclusive_group(required=True)
     group.add_argument("--all", action="store_true", help="all registered platforms")
-    group.add_argument("--platform", type=platform_arg, help="single platform name")
+    group.add_argument("--platform", "-p", type=platform_arg, help="single platform name")
     parser.add_argument(
         "--output-dir",
         default=DEFAULT_OUTPUT_DIR,