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/reflection/.github/workflows/integrate.yaml

@@ -0,0 +1,71 @@
+# https://docs.github.com/en/actions
+
+name: "Integrate"
+
+on: # yamllint disable-line rule:truthy
+  push:
+    branches:
+      - "6.x"
+  pull_request: null
+  # Allow manually triggering the workflow.
+  workflow_dispatch: null
+
+jobs:
+  code-coverage:
+    name: "Code Coverage"
+    uses: "phpDocumentor/.github/.github/workflows/code-coverage.yml@v0.9"
+    with:
+      php-version: "8.2"
+
+  coding-standards:
+    name: "Coding Standards"
+    runs-on: "ubuntu-22.04"
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v6"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "8.2"
+          tools: "cs2pr"
+
+      - name: "Install dependencies with Composer"
+        uses: "ramsey/composer-install@v3"
+        with:
+          dependency-versions: "locked"
+
+      - name: "Run PHP_CodeSniffer"
+        run: "vendor/bin/phpcs -q --no-colors --report=checkstyle | cs2pr"
+
+  dependency-analysis:
+    name: "Dependency analysis"
+    uses: "phpDocumentor/.github/.github/workflows/dependency-analysis.yml@v0.9"
+    with:
+      php-version: "8.2"
+
+  lint-root:
+    name: "Lint root"
+    uses: "phpDocumentor/.github/.github/workflows/lint.yml@v0.9"
+    with:
+      php-version: "8.2"
+      composer-options: "--no-check-publish --ansi"
+
+  static-analysis:
+    name: "Static analysis"
+    uses: "phpDocumentor/.github/.github/workflows/static-analysis.yml@main"
+    with:
+      php-version: "8.2"
+      php-extensions: "none, ctype, dom, json, mbstring, phar, simplexml, tokenizer, xml, xmlwriter, fileinfo, pcntl, posix"
+
+  unit-tests:
+    name: "Unit test"
+    uses: "phpDocumentor/.github/.github/workflows/continuous-integration.yml@v0.9"
+
+  integration-tests:
+    name: "Integration test"
+    uses: "phpDocumentor/.github/.github/workflows/continuous-integration.yml@v0.9"
+    needs: "unit-tests"
+    with:
+      test-suite: "integration"