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

home/roles/development/skills/beads_implement.md

@@ -54,6 +54,8 @@ When this command is invoked:
    - Read `thoughts/beads-{bead-id}/plan.md` FULLY
    - Check for any existing checkmarks (- [x]) indicating partial progress
    - Read any research at `thoughts/beads-{bead-id}/research.md`
+   - If plan's Success Criteria references contribution guidelines (e.g., "Per CONTRIBUTING.md:"),
+     verify the original CONTRIBUTING.md still exists and requirements are current
 
 5. **Mark bead in progress** (if not already):
    ```bash
@@ -127,6 +129,10 @@ All phases completed and automated verification passed:
 - {List manual verification items from plan}
 
 Let me know when manual testing is complete so I can close the bead.
+
+**Contribution guidelines compliance:**
+- {List any contribution guideline requirements that were part of Success Criteria}
+- {Note if any requirements could not be automated and need manual review}
 ```
 
 **STOP HERE and wait for user confirmation.**