[docs] Power-user quickstart

  Context: Make the power-user path discoverable from the top-level README.
  Scope: README "Power User (run it yourself with Claude Code)" section linking apps/cli/README.md;
  update CONTRIBUTING project-structure tree for the new packages.
  Acceptance:
  - [ ] README documents the clone → Claude Code → /evaluate-cv flow
  - [ ] Structure docs list schemas, intelligence, prompts, eval, apps/cli