Adding Markee messages to skill.md files

The goal is: onchain leaderboard state change → backend detects it → rewrites the MARKEE block in a repo's SKILL.md via GitHub API → instant commit to main.


Components needed

  1. GitHub App setup
  2. Subgraph event listener
  3. MARKEE block renderer
  4. GitHub Contents API writer
  5. Repo registry
  6. Maintainer onboarding flow

Checklist