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.

views/settings-v2/tab-memanto.php

@@ -0,0 +1,108 @@
+<?php
+/**
+ * Settings V2: MEMANTO.
+ *
+ * @package WP_Agentic_Writer
+ */
+
+if (!defined("ABSPATH")) {
+    exit();
+} ?>
+<div class="section-head"><div><p class="eyebrow"><?php esc_html_e(
+    "Memory",
+    "wp-agentic-writer",
+); ?></p><h2><?php esc_html_e(
+    "MEMANTO Context Keeper",
+    "wp-agentic-writer",
+); ?></h2><p><?php esc_html_e(
+    "Optional persistent memory for agentic writing sessions.",
+    "wp-agentic-writer",
+); ?></p></div><span class="status <?php echo $memanto_enabled
+    ? "connected"
+    : "warn"; ?>"><?php echo $memanto_enabled
+    ? esc_html__("Enabled", "wp-agentic-writer")
+    : esc_html__("Optional", "wp-agentic-writer"); ?></span></div>
+
+<div class="panel">
+	<div class="panel-head"><div class="panel-title"><h3><?php esc_html_e(
+     "Integration",
+     "wp-agentic-writer",
+ ); ?></h3><p><?php esc_html_e(
+    "Connect your MEMANTO instance and Moorcheh key.",
+    "wp-agentic-writer",
+); ?></p></div><button type="button" class="btn btn-small" id="wpaw-test-memanto"><?php esc_html_e(
+    "Test connection",
+    "wp-agentic-writer",
+); ?></button></div>
+	<div class="panel-body">
+		<label class="switch-row"><input type="checkbox" name="wp_agentic_writer_settings[memanto_enabled]" value="1" <?php checked(
+      $memanto_enabled,
+  ); ?>><span class="switch"></span><span><?php esc_html_e(
+    "Enable MEMANTO",
+    "wp-agentic-writer",
+); ?></span></label>
+
+		<div class="grid-2" style="margin-top:14px">
+			<div class="field">
+				<label for="memanto_url"><?php esc_html_e(
+        "Instance URL",
+        "wp-agentic-writer",
+    ); ?></label>
+				<input class="field-control" type="url" id="memanto_url" name="wp_agentic_writer_settings[memanto_url]" value="<?php echo esc_attr(
+        $memanto_url,
+    ); ?>" placeholder="https://your-memanto-instance.com">
+			</div>
+			<div class="field">
+				<label for="memanto_license_key"><?php esc_html_e(
+        "Instance license key",
+        "wp-agentic-writer",
+    ); ?></label>
+				<input class="field-control" type="text" id="memanto_license_key" name="wp_agentic_writer_settings[memanto_license_key]" value="<?php echo esc_attr(
+        $memanto_license_key,
+    ); ?>">
+			</div>
+		</div>
+
+		<div class="field" style="margin-top:14px">
+			<label for="memanto_moorcheh_key"><?php esc_html_e(
+       "Moorcheh API key",
+       "wp-agentic-writer",
+   ); ?></label>
+			<div class="password-row">
+				<input class="field-control" type="password" id="memanto_moorcheh_key" name="wp_agentic_writer_settings[memanto_moorcheh_key]" value="<?php echo esc_attr(
+        $memanto_moorcheh_key,
+    ); ?>">
+				<button type="button" class="btn" data-aw2-toggle-password="#memanto_moorcheh_key"><?php esc_html_e(
+        "Show",
+        "wp-agentic-writer",
+    ); ?></button>
+			</div>
+		</div>
+	</div>
+</div>
+
+<div class="panel"><div class="panel-head"><div class="panel-title"><h3><?php esc_html_e(
+    "What MEMANTO does",
+    "wp-agentic-writer",
+); ?></h3><p><?php esc_html_e(
+    "Keeps preferences and context across writing sessions.",
+    "wp-agentic-writer",
+); ?></p></div></div><div class="panel-body grid-3"><div class="guide-card"><h3><?php esc_html_e(
+    "Remembers context",
+    "wp-agentic-writer",
+); ?></h3><p class="help"><?php esc_html_e(
+    "Carry preferences across posts and refreshes.",
+    "wp-agentic-writer",
+); ?></p></div><div class="guide-card"><h3><?php esc_html_e(
+    "Reduces tokens",
+    "wp-agentic-writer",
+); ?></h3><p class="help"><?php esc_html_e(
+    "Recall relevant memory instead of resending all context.",
+    "wp-agentic-writer",
+); ?></p></div><div class="guide-card"><h3><?php esc_html_e(
+    "Optional",
+    "wp-agentic-writer",
+); ?></h3><p class="help"><?php esc_html_e(
+    "Agentic Writer works without MEMANTO.",
+    "wp-agentic-writer",
+); ?></p></div></div></div>