feat(observer): re-enable ExternalTaskAgentObserver and improve error handling #259

- Re-enable ExternalTaskAgentObserver in autodev-core.xml.
- Format build issue prompt with code block in ExternalTaskAgentObserver.
- Remove unused debugging method `getThreadTrace`.
- Wrap error notification in `runInEdt` for thread safety in AgentObserver.

Author: phodal

core/src/233/main/resources/META-INF/autodev-core.xml

@@ -277,7 +277,7 @@
         <toolchainFunctionProvider implementation="cc.unitmesh.devti.mcp.client.McpFunctionProvider"/>
 
         <agentObserver implementation="cc.unitmesh.devti.observer.TestAgentObserver" />
-<!--        <agentObserver implementation="cc.unitmesh.devti.observer.ExternalTaskAgentObserver" />-->
+        <agentObserver implementation="cc.unitmesh.devti.observer.ExternalTaskAgentObserver" />
     </extensions>
 
     <actions>

core/src/main/kotlin/cc/unitmesh/devti/observer/ExternalTaskAgentObserver.kt

@@ -48,25 +48,13 @@ class ExternalTaskAgentObserver : AgentObserver, Disposable {
                 exitCode: Int
             ) {
                 if (handler is ExternalSystemProcessHandler && exitCode != 0) {
-                    val prompt = "Help Me fix follow build issue:\n$globalBuffer"
+                    val prompt = "Help Me fix follow build issue:\n```bash\n$globalBuffer\n```\n"
                     sendErrorNotification(project, prompt)
                 }
             }
         })
     }
 
-    private fun getThreadTrace(thread: Thread, depth: Int): String { // debugging
-        val buf = StringBuilder()
-        val trace = thread.getStackTrace()
-        var i = 0
-        while (i < depth && i < trace.size) {
-            val element = trace[i]
-            buf.append("\tat ").append(element).append("\n")
-            i++
-        }
-        return buf.toString()
-    }
-
     override fun dispose() {
         connection?.disconnect()
     }

core/src/main/kotlin/cc/unitmesh/devti/provider/observer/AgentObserver.kt

@@ -2,15 +2,18 @@ package cc.unitmesh.devti.provider.observer
 
 import cc.unitmesh.devti.gui.chat.message.ChatActionType
 import cc.unitmesh.devti.gui.sendToChatWindow
+import com.intellij.openapi.application.runInEdt
 import com.intellij.openapi.extensions.ExtensionPointName
 import com.intellij.openapi.project.Project
 
 interface AgentObserver {
     fun onRegister(project: Project)
 
     fun sendErrorNotification(project: Project, prompt: String) {
-        sendToChatWindow(project, ChatActionType.CHAT) { contentPanel, _ ->
-            contentPanel.setInput(prompt)
+        runInEdt {
+            sendToChatWindow(project, ChatActionType.CHAT) { contentPanel, _ ->
+                contentPanel.setInput(prompt)
+            }
         }
     }