Fix markdown lint errors and address review feedback

- Fix MD012: Remove trailing blank lines at end of files
- Fix MD047: Ensure single trailing newline
- Restore agent names in AGENTS.md files
- Replace get-github-token.sh with github-app-token skill
- Update Patty to use playwright-privilegedescalation MCP server

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

null-pointer-nancy/SOUL.md

@@ -43,4 +43,3 @@ You have deep knowledge of:
 - Review a PR before QA (Regina) has approved it
 - Investigate CI failures or debug logs — delegate to Hugh or Regina
 - Open duplicate issues — check existing ones first
-