feat(skills): Add contribution guidelines check to beads skills

home/roles/development/skills/parallel_beads.md

@@ -134,10 +134,12 @@ Worktree path: [WORKTREE_PATH]
      - Read the plan and find the "Automated Verification" section
      - Extract each verification command (lines starting with `- [ ]` followed by a command)
      - Example: `- [ ] Tests pass: \`make test\`` → extract `make test`
+     - Note any "Per CONTRIBUTING.md:" requirements for additional validation
    - If no plan exists, use best-effort validation:
      - Check if `Makefile` exists → try `make test` and `make lint`
      - Check if `flake.nix` exists → try `nix flake check`
      - Check if `package.json` exists → try `npm test`
+     - **Check for CONTRIBUTING.md** → read and extract testing/linting requirements
      - If none found, note "No validation criteria found"
 
 5. **Implement the changes**: