fix: simplify Claude workflows with clean username checks

- Simplify all permission checks to single username validation
- Remove complex permission logic for cleaner workflows
- Streamline issue implementation workflow
- Streamline PR assistant workflow
- Keep only essential functionality
- Fix YAML syntax issues
- Validate all workflows successfully

Changes:
- Single username check: context.actor !== 'bvdaakster'
- Simplified error messages
- Clean YAML structure
- Reduced complexity while maintaining functionality

All workflows now use simple, reliable permission checks.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.github/workflows/claude-code-review.yml

@@ -12,20 +12,8 @@ on:
 
 jobs:
   claude-review:
-    # Permission filter: Only allow bvdaakster to trigger reviews
+    # Only allow bvdaakster to trigger reviews
     if: github.event.pull_request.user.login == 'bvdaakster'
-
-    # Alternative filters (comment out the above and use one of these):
-    # Only for external contributors:
-    # if: github.event.pull_request.author_association == 'FIRST_TIME_CONTRIBUTOR'
-
-    # Only for specific users:
-    # if: contains(fromJSON('["username1", "username2"]'), github.event.pull_request.user.login)
-
-    # Only for non-admins (let admins skip review):
-    # if: |
-    #   github.event.pull_request.author_association != 'OWNER' &&
-    #   github.event.pull_request.author_association != 'MEMBER'
     
     runs-on: ubuntu-latest
     permissions: