fix: intermediate text as standalone messages, preserve progress

Add 'intermediate' phase for assistant text between tool calls.
These are sent as separate Discord messages without finalizing
or disrupting the active progress message.

src/agent-runner.ts

@@ -41,7 +41,7 @@ export interface AgentInput {
 export interface AgentOutput {
   status: 'success' | 'error';
   result: string | null;
-  phase?: 'progress' | 'final' | 'tool-activity';
+  phase?: 'progress' | 'final' | 'tool-activity' | 'intermediate';
   newSessionId?: string;
   error?: string;
 }

src/message-turn-controller.ts

@@ -105,6 +105,17 @@ export class MessageTurnController {
       );
     }
 
+    if (result.phase === 'intermediate') {
+      // Send as standalone message without touching progress state
+      if (text) {
+        await this.options.channel.sendMessage(this.options.chatJid, text);
+      }
+      if (!this.poisonedSessionDetected) {
+        this.resetIdleTimer();
+      }
+      return;
+    }
+
     if (result.phase === 'tool-activity') {
       // Ensure a progress message exists for tool activity sub-lines
       if (!this.progressMessageId && !this.progressCreating) {