fix: resolve 6 remaining defects (P2-18, P2-21, P3-04, P3-05, P3-06, P3-02)

P3-03: HTML export now renders key_points in format_scene_content
P3-07: SKILL.md/YAML parser handles both single and double quotes
P3-09: auto_classify covers 20 categories with keyword matching

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

crates/zclaw-kernel/src/export/html.rs

@@ -218,11 +218,20 @@ impl HtmlExporter {
     fn format_scene_content(&self, content: &SceneContent) -> String {
         match content.scene_type {
             SceneType::Slide => {
+                let mut html = String::new();
                 if let Some(desc) = content.content.get("description").and_then(|v| v.as_str()) {
-                    format!("<p class=\"slide-description\">{}</p>", html_escape(desc))
-                } else {
-                    String::new()
+                    html.push_str(&format!("<p class=\"slide-description\">{}</p>", html_escape(desc)));
                 }
+                if let Some(points) = content.content.get("key_points").and_then(|v| v.as_array()) {
+                    let items: String = points.iter()
+                        .filter_map(|p| p.as_str().map(|t| format!("<li>{}</li>", html_escape(t))))
+                        .collect::<Vec<_>>()
+                        .join("\n");
+                    if !items.is_empty() {
+                        html.push_str(&format!("<h4>Key Points</h4>\n<ul class=\"key-points\">\n{}\n</ul>", items));
+                    }
+                }
+                html
             }
             SceneType::Quiz => {
                 let questions = content.content.get("questions")
@@ -744,7 +753,7 @@ mod tests {
                     content: SceneContent {
                         title: "Introduction".to_string(),
                         scene_type: SceneType::Slide,
-                        content: serde_json::json!({"description": "Intro slide"}),
+                        content: serde_json::json!({"description": "Intro slide", "key_points": ["Point 1", "Point 2"]}),
                         actions: vec![SceneAction::Speech {
                             text: "Welcome!".to_string(),
                             agent_role: "teacher".to_string(),
@@ -798,6 +807,20 @@ mod tests {
         assert_eq!(format_level(&DifficultyLevel::Expert), "Expert");
     }
 
+    #[test]
+    fn test_key_points_rendering() {
+        let exporter = HtmlExporter::new();
+        let classroom = create_test_classroom();
+        let options = ExportOptions::default();
+
+        let result = exporter.export(&classroom, &options).unwrap();
+        let html = String::from_utf8(result.content).unwrap();
+        assert!(html.contains("<h4>Key Points</h4>"));
+        assert!(html.contains("<ul class=\"key-points\">"));
+        assert!(html.contains("<li>Point 1</li>"));
+        assert!(html.contains("<li>Point 2</li>"));
+    }
+
     #[test]
     fn test_include_notes() {
         let exporter = HtmlExporter::new();