Adds title, description, type, domain, and tags frontmatter to every
doc for improved KB semantic search. The description field is prepended
to every search chunk, and domain/type/tags enable filtered queries.
Type values: context, guide, runbook, reference, troubleshooting
Domain values match directory structure (networking, docker, etc.)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
