category was retrieved from CSR data with a silent "" default and used directly as a (csr_dir, category) dict key. An unrecognized, empty, or non-string category would silently drop CSRs from the WARL/WLRL grouped tables rather than producing a controlled error.

Changes

• tools/create_csr_appendix.py — write_output_files: replace the unvalidated csr.get("category", "") with explicit checks:
  • Fatals if category is missing, empty, or not a string
  • Fatals if category is not in IMPLDEF_CATEGORIES, listing allowed values in the error message

# Before
category = csr.get("category", "")
chapter_category_files.setdefault((csr_dir, category), []).append(f"{file_stem}.adoc")

# After
category_value = csr.get("category")
if not isinstance(category_value, str) or not category_value:
    fatal(f"Expected non-empty category for CSR {name!r}")
category: str = category_value
if category not in IMPLDEF_CATEGORIES:
    allowed_str = ", ".join(IMPLDEF_CATEGORIES)
    fatal(
        f"Unrecognized category {category!r} for CSR {name!r}; "
        f"allowed values are: {allowed_str}"
    )
chapter_category_files.setdefault((csr_dir, category), []).append(f"{file_stem}.adoc")

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