Revert to issues.createComment with proper permissions

- Rename plugin from "ralph-wiggum" to "ralph-loop" to avoid trademark concerns
- Update all internal references to use "Ralph Loop" as the prominent name
- Keep explanatory text noting it "implements the Ralph Wiggum technique" (allowed)
- Rename plugin directory from plugins/ralph-wiggum to plugins/ralph-loop
- Update marketplace.json with new plugin name and source path
- Update plugin-dev documentation references

This change follows legal's recommendation to replace "Wiggum" with "Loop"
in the plugin name while still explaining the technique origin.

Slack thread: https://anthropic.slack.com/archives/C09KU300P7F/p1767741142753959

Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/close-external-prs.yml

@@ -4,6 +4,10 @@ on:
   pull_request_target:
     types: [opened]
 
+permissions:
+  pull-requests: write
+  issues: write
+
 jobs:
   check-membership:
     if: vars.DISABLE_EXTERNAL_PR_CHECK != 'true'