Merge main into feature/testing-framework

Resolved conflicts:
- package.json: Use version 0.1.15 from main
- wp-plugin-starter-template.php: Use version 0.1.15, keep Plugin class usage
- AGENTS.md: Merge both versions, keep CI/CD content
- .wiki/Architecture-Overview.md: Use .agents/ directory structure
- wiki/* files: Delete (moved to .wiki/)
- .agents/error-checking-feedback-loops.md: Keep from feature branch

Also includes:
- Renamed .ai-workflows/ to .agents/
- Renamed .ai-assistant.md to AGENTS.md
- Updated version to 0.1.15

.wiki/Architecture-Overview.md

@@ -30,10 +30,7 @@ wp-plugin-starter-template/
 │   └── setup-test-env.sh   # Test environment setup script
 ├── .github/                # GitHub-specific files
 │   └── workflows/          # GitHub Actions workflows
-├── .wp-env.json            # WordPress environment config
-├── .wp-env.multisite.json  # Multisite environment config
-├── cypress.config.js       # Cypress configuration
-├── .ai-workflows/          # AI workflow documentation
+├── .agents/                # AI workflow documentation
 ├── .wiki/                  # Wiki documentation
 │   ├── Testing-Framework.md  # Testing framework documentation
 │   └── Multisite-Development.md # Multisite development guide