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/squizlabs/php_codesniffer/src/Reports/Gitblame.php

@@ -0,0 +1,91 @@
+<?php
+/**
+ * Git blame report for PHP_CodeSniffer.
+ *
+ * @author    Ben Selby <benmatselby@gmail.com>
+ * @author    Greg Sherwood <gsherwood@squiz.net>
+ * @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
+ * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/HEAD/licence.txt BSD Licence
+ */
+
+namespace PHP_CodeSniffer\Reports;
+
+use PHP_CodeSniffer\Exceptions\DeepExitException;
+
+class Gitblame extends VersionControl
+{
+
+    /**
+     * The name of the report we want in the output
+     *
+     * @var string
+     */
+    protected $reportName = 'GIT';
+
+
+    /**
+     * Extract the author from a blame line.
+     *
+     * @param string $line Line to parse.
+     *
+     * @return mixed string or false if impossible to recover.
+     */
+    protected function getAuthor($line)
+    {
+        $blameParts = [];
+        $line       = preg_replace('|\s+|', ' ', $line);
+        preg_match(
+            '|\(.+[0-9]{4}-[0-9]{2}-[0-9]{2}\s+[0-9]+\)|',
+            $line,
+            $blameParts
+        );
+
+        if (isset($blameParts[0]) === false) {
+            return false;
+        }
+
+        $parts = explode(' ', $blameParts[0]);
+
+        if (count($parts) < 2) {
+            return false;
+        }
+
+        $parts  = array_slice($parts, 0, (count($parts) - 2));
+        $author = preg_replace('|\(|', '', implode(' ', $parts));
+        return $author;
+
+    }//end getAuthor()
+
+
+    /**
+     * Gets the blame output.
+     *
+     * @param string $filename File to blame.
+     *
+     * @return array
+     * @throws \PHP_CodeSniffer\Exceptions\DeepExitException
+     */
+    protected function getBlameContent($filename)
+    {
+        $cwd = getcwd();
+
+        chdir(dirname($filename));
+        $command = 'git blame --date=short "'.basename($filename).'" 2>&1';
+        $handle  = popen($command, 'r');
+        if ($handle === false) {
+            $error = 'ERROR: Could not execute "'.$command.'"'.PHP_EOL.PHP_EOL;
+            throw new DeepExitException($error, 3);
+        }
+
+        $rawContent = stream_get_contents($handle);
+        pclose($handle);
+
+        $blames = explode("\n", $rawContent);
+        chdir($cwd);
+
+        return $blames;
+
+    }//end getBlameContent()
+
+
+}//end class