让免费层限流的报告跟真实限流一致，并给少一块结果的静默失败留下函数名和错误类型。

Co-Authored-By: Grok (agent loop)

tests/test_python_hygiene_budget.py

@@ -0,0 +1,53 @@
+"""Budgets that only allow the silent-except and scripts-root counts to fall."""
+
+from __future__ import annotations
+
+import ast
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+SCRIPTS = ROOT / "scripts"
+
+# Measured at the end of TASK-python-hygiene-20261013. New silent handlers
+# must log or carry ``# noqa: BLE001`` with a reason. New research scripts
+# belong in scripts/audit or scripts/research.
+SILENT_EXCEPT_BUDGET = 0
+ROOT_PY_BUDGET = 446
+
+
+def _silent_handlers() -> list[str]:
+    hits: list[str] = []
+    paths = list(SCRIPTS.glob("*.py")) + [ROOT / "mcp_server.py"]
+    for path in paths:
+        source = path.read_text(encoding="utf-8")
+        lines = source.splitlines()
+        tree = ast.parse(source)
+        for node in ast.walk(tree):
+            if not isinstance(node, ast.ExceptHandler):
+                continue
+            typ = node.type
+            broad = typ is None or (isinstance(typ, ast.Name) and typ.id in {"Exception", "BaseException"})
+            if not broad or len(node.body) != 1:
+                continue
+            stmt = node.body[0]
+            silent = isinstance(stmt, (ast.Pass, ast.Continue)) or (
+                isinstance(stmt, ast.Return)
+                and (stmt.value is None or (isinstance(stmt.value, ast.Constant) and stmt.value.value is None))
+            )
+            if not silent:
+                continue
+            segment = "\n".join(lines[node.lineno - 1: node.end_lineno])
+            if "noqa: BLE001" in segment:
+                continue
+            hits.append(f"{path.relative_to(ROOT).as_posix()}:{node.lineno}")
+    return hits
+
+
+def test_silent_except_budget_does_not_grow() -> None:
+    hits = _silent_handlers()
+    assert len(hits) <= SILENT_EXCEPT_BUDGET, hits
+
+
+def test_scripts_root_py_count_does_not_grow() -> None:
+    count = len(list(SCRIPTS.glob("*.py")))
+    assert count <= ROOT_PY_BUDGET, count