fix: classify direct report artifacts by status

Treat direct skill report-artifact payloads as task outcomes so partial and empty reports stay successful while blocked and error statuses fail explicitly.

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

src/agent/mod.rs

@@ -233,9 +233,9 @@ pub fn handle_browser_message_with_context<T: Transport + 'static>(
                             &context.workspace_root,
                             &settings,
                         ) {
-                            Ok(summary) => AgentMessage::TaskComplete {
-                                success: true,
-                                summary,
+                            Ok(outcome) => AgentMessage::TaskComplete {
+                                success: outcome.success,
+                                summary: outcome.summary,
                             },
                             Err(err) => AgentMessage::TaskComplete {
                                 success: false,