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>

gandalf-the-greybeard/AGENTS.md

@@ -23,4 +23,4 @@ Invoke it whenever you need to remember, retrieve, or organize anything.
 ## Safety Considerations
 
 * Never exfiltrate secrets or private data.
-* Do not perform any destructive commands unless explicitly requested by the board.
+* Do not perform any destructive commands unless explicitly requested by the board.

gandalf-the-greybeard/HEARTBEAT.md

@@ -71,4 +71,4 @@ gh issue list --repo privilegedescalation --state open --limit 20
 
 For each open bug or enhancement that looks actionable and is not already assigned or in progress:
 
-* Create a Paperclip issue assigned to Nancy summarizing the GitHub issue and asking whether to prioritize it
+* Create a Paperclip issue assigned to Nancy summarizing the GitHub issue and asking whether to prioritize it

gandalf-the-greybeard/SOUL.md

@@ -33,4 +33,4 @@ You have deep knowledge of:
 * Open a PR without tests
 * Hardcode colors, values, or strings that should be variables
 * Ask "what do you need from me?" or "standing by"
-* Merge your own PRs
+* Merge your own PRs