[2.26.4] Add Compound Engineered badge to /workflows:work PRs

- Updated PR template to include badge at bottom linking to plugin repo
- Added badge requirement to quality checklist
- Badge provides attribution and link to the plugin

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

plugins/compound-engineering/commands/workflows/work.md

@@ -227,7 +227,9 @@ This command takes a work document (plan, specification, or todo file) and execu
    ## Figma Design
    [Link if applicable]
 
-   🤖 Generated with [Claude Code](https://claude.com/claude-code)
+   ---
+
+   [![Compound Engineered](https://img.shields.io/badge/Compound-Engineered-6366f1)](https://github.com/EveryInc/compound-engineering-plugin) 🤖 Generated with [Claude Code](https://claude.com/claude-code)
    EOF
    )"
    ```
@@ -286,6 +288,7 @@ Before creating PR, verify:
 - [ ] Before/after screenshots captured and uploaded (for UI changes)
 - [ ] Commit messages follow conventional format
 - [ ] PR description includes summary, testing notes, and screenshots
+- [ ] PR description includes Compound Engineered badge
 
 ## When to Use Reviewer Agents