plugins/lint/docs/research/docs/vale/ had no top-level index pointing
into it, unlike plugins/kyberforge/docs/README.md which indexes its
own research directories. Add plugins/lint/docs/README.md mirroring
that convention: one line per file describing what it covers, plus a
provenance note tying the directory back to plugins/lint/sources.md
and the vale-config/vale-run skills that consume it.
Closes out a follow-up item from PR #85's review.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MCQ648fLSFXPHGZdQ8gn58
