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>

kubectl-karen/AGENTS.md

@@ -27,4 +27,4 @@ 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.

kubectl-karen/PRODUCT-CONTEXT.md

@@ -107,4 +107,4 @@ What must exist in the cluster for this plugin to work? (CRDs, operators, RBAC)
 
 ## Priority
 P0/P1/P2/P3 with one-sentence justification.
-```
+```