feat(telegram): display tool execution status messages

Telegram bot now shows tool status during execution:
- Sends status message when tool starts (tool name + args snippet)
- Edits status message with result on completion
- Keeps typing indicator active during tool execution
- Adds setOnToolUse() to NativeAgent for per-message callback control

src/backends/native/agent.ts

@@ -190,4 +190,8 @@ export class NativeAgent {
   getModelTier(): ModelTier {
     return this.currentTier;
   }
+
+  setOnToolUse(callback: ((event: ToolUseEvent) => void) | undefined): void {
+    this.onToolUse = callback;
+  }
 }

src/frontends/telegram/bot.ts

@@ -97,9 +97,44 @@ export function createTelegramBot(config: TelegramBotConfig): Bot {
     // Show typing indicator
     await ctx.replyWithChatAction('typing');
 
+    // Set up tool status display for this message
+    let statusMsgId: number | undefined;
+    config.agent.setOnToolUse(async (event) => {
+      try {
+        if (event.type === 'start') {
+          const argsSnippet = event.args ? ` ${JSON.stringify(event.args).slice(0, 100)}` : '';
+          const statusText = `⚡ ${event.tool}${argsSnippet}`;
+          const msg = await ctx.reply(statusText);
+          statusMsgId = msg.message_id;
+          // Keep typing indicator active
+          await ctx.replyWithChatAction('typing');
+        } else if (event.type === 'end' && event.result && statusMsgId) {
+          const icon = event.result.success ? '✓' : '✗';
+          const detail = event.result.success
+            ? `${event.result.output.split('\n').length} lines`
+            : (event.result.error ?? 'error');
+          try {
+            await ctx.api.editMessageText(
+              ctx.chat.id,
+              statusMsgId,
+              `${icon} ${event.tool}: ${detail}`,
+            );
+          } catch {
+            // Edit may fail if message was deleted; ignore
+          }
+          statusMsgId = undefined;
+        }
+      } catch {
+        // Don't let status display errors break the tool loop
+      }
+    });
+
     try {
       const response = await handleMessage(text);
 
+      // Clear tool use callback
+      config.agent.setOnToolUse(undefined);
+
       // Telegram has a 4096 character limit per message
       if (response.length <= 4096) {
         await ctx.reply(response, { parse_mode: 'Markdown' });
@@ -111,6 +146,7 @@ export function createTelegramBot(config: TelegramBotConfig): Bot {
         }
       }
     } catch (error) {
+      config.agent.setOnToolUse(undefined);
       console.error('Error processing message:', error);
       await ctx.reply('Sorry, an error occurred while processing your message.');
     }