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/phpdocumentor/filesystem/composer.json

@@ -0,0 +1,35 @@
+{
+    "name": "phpdocumentor/filesystem",
+    "description": "Filesystem abstraction for phpdocumentor projects.",
+    "type": "library",
+    "license": "MIT",
+    "homepage": "https://www.phpdoc.org",
+    "config": {
+        "sort-packages": true
+    },
+    "autoload": {
+        "psr-4": {
+            "phpDocumentor\\FileSystem\\": "src/"
+        },
+        "classmap": [
+            "Flysystem/"
+        ]
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "phpDocumentor\\FileSystem\\": [
+                "tests/unit/"
+            ]
+        }
+    },
+    "minimum-stability": "stable",
+    "require": {
+        "php": "^8.1",
+        "webmozart/assert": "^1.3"
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-main": "1.x-dev"
+        }
+    }
+}