Test: processor.ts + Markdoc config.ts coverage

[wab]

Parent

#121

What to build

Cover Markdoc transforms and content processing — frontmatter parsing edge cases, custom tag transforms (potential XSS vector), and content normalization.

Acceptance criteria

• processor.ts tested with valid + malformed frontmatter
• YAML edge cases: empty strings, nested objects, date coercion
• config.ts custom Markdoc tags: each has at least one test
• Raw HTML / unsafe input is sanitized
• ≥ 15 test cases

Blocked by

None - can start immediately