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/nikic/php-parser/lib/PhpParser/PrettyPrinter.php

@@ -0,0 +1,51 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser;
+
+use PhpParser\Node\Expr;
+
+interface PrettyPrinter {
+    /**
+     * Pretty prints an array of statements.
+     *
+     * @param Node[] $stmts Array of statements
+     *
+     * @return string Pretty printed statements
+     */
+    public function prettyPrint(array $stmts): string;
+
+    /**
+     * Pretty prints an expression.
+     *
+     * @param Expr $node Expression node
+     *
+     * @return string Pretty printed node
+     */
+    public function prettyPrintExpr(Expr $node): string;
+
+    /**
+     * Pretty prints a file of statements (includes the opening <?php tag if it is required).
+     *
+     * @param Node[] $stmts Array of statements
+     *
+     * @return string Pretty printed statements
+     */
+    public function prettyPrintFile(array $stmts): string;
+
+    /**
+     * Perform a format-preserving pretty print of an AST.
+     *
+     * The format preservation is best effort. For some changes to the AST the formatting will not
+     * be preserved (at least not locally).
+     *
+     * In order to use this method a number of prerequisites must be satisfied:
+     *  * The startTokenPos and endTokenPos attributes in the lexer must be enabled.
+     *  * The CloningVisitor must be run on the AST prior to modification.
+     *  * The original tokens must be provided, using the getTokens() method on the lexer.
+     *
+     * @param Node[] $stmts Modified AST with links to original AST
+     * @param Node[] $origStmts Original AST with token offset information
+     * @param Token[] $origTokens Tokens of the original code
+     */
+    public function printFormatPreserving(array $stmts, array $origStmts, array $origTokens): string;
+}