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>

countess-von-containerheim/HEARTBEAT.md

@@ -200,4 +200,3 @@ Each heartbeat, take one action that moves the org forward. Examples:
 - Identify a gap in the roadmap and create an issue for the right agent
 - Review a PR that needs a leadership decision
 - Assess whether the current work matches the org's actual priorities
-