fix: harden WASM phase 5 harness

tests/run_network_tests.py

@@ -222,6 +222,7 @@ def filter_cases(
 	name_pattern: Optional[str],
 	tags: List[str],
 	include_internal: bool,
+	excluded_names: List[str],
 ) -> List[NetworkTestCase]:
 	filtered = list(cases)
 	if plugins:
@@ -233,6 +234,9 @@ def filter_cases(
 		filtered = [case for case in filtered if matcher.search(case.name)]
 	if tags:
 		filtered = [case for case in filtered if any(tag in case.tags for tag in tags)]
+	if excluded_names:
+		excluded = set(excluded_names)
+		filtered = [case for case in filtered if case.name not in excluded]
 	return filtered
 
 
@@ -273,6 +277,7 @@ def build_parser() -> argparse.ArgumentParser:
 	parser.add_argument("--plugin-dir", default=str(base_dir / "plugins"), help="directory containing plugin files")
 	parser.add_argument("--plugin", action="append", default=[], help="limit to one or more plugin basenames")
 	parser.add_argument("--match", help="regex filter for case names")
+	parser.add_argument("--exclude", action="append", default=[], help="exclude an exact test case name after other filters")
 	parser.add_argument("--tag", action="append", default=[], help="only run cases with at least one matching tag")
 	parser.add_argument("--include-internal", action="store_true", help="include tests tagged internal in the run")
 	parser.add_argument("--list", action="store_true", help="list discovered tests without running them")
@@ -316,7 +321,7 @@ def main(argv: Optional[List[str]] = None) -> int:
 	for plugin_path in plugin_files:
 		register_plugin_cases(registry, plugin_path)
 
-	cases = filter_cases(registry.cases, args.plugin, args.match, args.tag, args.include_internal)
+	cases = filter_cases(registry.cases, args.plugin, args.match, args.tag, args.include_internal, args.exclude)
 	if not cases:
 		print("No tests matched the selected filters", file=sys.stderr)
 		return 2