Initial commit: AutoBlogger v0.1.0

WordPress plugin that auto-researches topics from Reddit, generates
SEO-optimized articles via OpenRouter LLMs, runs them through a chief
editor agent, and publishes on a daily schedule.

Includes:
- Full generation pipeline (collect → analyze → score → generate → review → publish)
- Cost tracking and budget enforcement
- Admin UI: settings, review queue, metrics, activity log
- CI/CD pipeline (GitHub Actions → WordPress REST deploy)
- Unit test suite (PHPUnit + Brain Monkey)
- Structured logging with configurable verbosity

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

includes/admin/class-post-metabox.php

@@ -0,0 +1,54 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * Adds a metabox to posts showing AutoBlogger generation metadata.
+ *
+ * Only appears on posts that were generated by AutoBlogger (checked via
+ * _autoblogger_generated post meta).
+ *
+ * Triggered by: Autoblogger::register_admin_hooks() on `add_meta_boxes`.
+ * Dependencies: WordPress post meta API.
+ *
+ * @see class-autoblogger.php     — Registers the hook.
+ * @see core/class-publisher.php  — Writes the metadata this class displays.
+ */
+class Autoblogger_Post_Metabox {
+
+	/**
+	 * Register the metabox for the post editor.
+	 *
+	 * @return void
+	 */
+	public function on_register_metabox(): void {
+		$screen = get_current_screen();
+		if ( ! $screen || 'post' !== $screen->id ) {
+			return;
+		}
+
+		global $post;
+		if ( ! $post || '1' !== get_post_meta( $post->ID, '_autoblogger_generated', true ) ) {
+			return;
+		}
+
+		add_meta_box(
+			'autoblogger_generation_info',
+			__( 'AutoBlogger Generation Info', 'autoblogger' ),
+			[ $this, 'render_metabox' ],
+			'post',
+			'side',
+			'default'
+		);
+	}
+
+	/**
+	 * Render the generation metadata metabox.
+	 *
+	 * @param \WP_Post $post
+	 *
+	 * @return void
+	 */
+	public function render_metabox( \WP_Post $post ): void {
+		include AUTOBLOGGER_PLUGIN_DIR . 'templates/admin/metabox-generation-info.php';
+	}
+}