- .claude/skills/write-brd: the built skill (thin SKILL.md, 7 reference
  files, 9 output templates, Neil AP product KB shipped as reference)
- brd-skill-prompt.md (authoritative spec), write-brd-research-distilled.md
  (research handoff), research-report.md (full survey), NEIL-AP-PRODUCT.md
- .claude/skills/write-prd and interrogate: sibling reference skills
- README describing the repo; validation phase pending

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>