Add AI writing assistant plugin with local backend, brave search, and image generation support

- Implement local backend AI provider with Ollama integration
- Add Brave Search API integration for real-time search suggestions
- Add image generation manager with multiple AI providers
- Create hybrid provider system with local/cloud fallback
- Add comprehensive settings UI with provider management
- Implement Gutenberg sidebar with writing assistance controls
- Add SEO schema generation for AI-generated content
- Multiple provider support: OpenRouter, local backend, Codex

includes/class-keyword-suggester.php

@@ -30,13 +30,14 @@ class WP_Agentic_Writer_Keyword_Suggester {
 	 * @return array|WP_Error Array with focus_keyword, secondary_keywords, reasoning, and cost.
 	 */
 	public static function suggest_keywords( $title, $sections, $language = 'english', $post_id = 0 ) {
-		$provider = WP_Agentic_Writer_OpenRouter_Provider::get_instance();
+		$provider = WP_Agentic_Writer_Provider_Manager::get_provider_for_task( 'clarity' );
 
 		// Build outline text from sections
 		$outline_text = '';
 		if ( is_array( $sections ) ) {
 			foreach ( $sections as $section ) {
-				$section_title = $section['title'] ?? '';
+				// Support both 'heading' (new format) and 'title' (legacy)
+				$section_title = $section['heading'] ?? $section['title'] ?? '';
 				if ( ! empty( $section_title ) ) {
 					$outline_text .= "- {$section_title}\n";
 				}