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

composer.json

@@ -2,7 +2,7 @@
     "name": "wpallstars/wp-plugin-starter-template-for-ai-coding",
     "description": "A starter template for WordPress plugins with AI development workflows.",
     "type": "wordpress-plugin",
-    "version": "0.1.10",
+    "version": "0.1.15",
     "license": "GPL-2.0-or-later",
     "authors": [
         {