def test_no_shipped_doc_is_silently_ignored():
        """EVERY .md in the directory must load — iterate the DIRECTORY, not the loaded set.
    
        This is the test that was missing. Its predecessor looped over ``load_guidelines()``, so a doc that
        FAILED to load was simply absent from the list and the loop never saw it: a test named "all parse"
        that could not fail on the only thing worth catching. oracle_walk.md sat unparseable and shipped
        under a green suite — a playbook its author believed was live that reached no agent, ever."""
>       assert bug_guidelines.validate_guidelines() == [], (
            "a doc in docs/agent_guidelines/ will not load — it reaches NO agent until fixed")
E       AssertionError: a doc in docs/agent_guidelines/ will not load — it reaches NO agent until fixed
E       assert [('tide_backf.../README.md)')] == []
E         
E         Left contains one more item: ('tide_backfill_to_2020.md', "no frontmatter — the file must OPEN with a '---' line (see docs/agent_guidelines/README.md)")
E         
E         Full diff:
E         - []
E         + [
E         +     (...
E         
E         ...Full output truncated (5 lines hidden), use '-vv' to show

tests/services/test_bug_guidelines.py:93: AssertionError