refactor: Cleanup git state - commit all staged changes

Major refactoring cleanup:
- Add new controller architecture (class-controller-*.php)
- Add new settings-v2 UI (views/settings-v2/)
- Add new CSS architecture (agentic-sidebar.css, tokens)
- Add esbuild build pipeline (scripts/build.js, package.json)
- Add composer dependencies (vendor/)
- Add frontend src directory (assets/js/src/index.jsx)
- Add documentation files
- Remove old/obsolete files (class-settings.php, old CSS)

This commits all pending changes from previous refactoring efforts.

vendor/parsica-php/parsica/infection.json

@@ -0,0 +1,19 @@
+{
+    "source": {
+        "directories": [
+            "src"
+        ],
+        "excludes": [
+                    "src/PHPUnit/ParserAssertions.php"
+                ]
+    },
+    "timeout": 5,
+    "logs": {
+        "text": "infection.log",
+        "perMutator": "per-mutator.md"
+    },
+    "mutators": {
+        "@default": true
+    },
+    "testFramework":"phpunit"
+}