fix: non-streaming tool calls now feed results back to AI for final answer

Previously tool calls in non-streaming path returned raw tool output as the
response. Now executes tool, sends results back to model for a synthesized
answer. Fixes the 'silent after streaming fallback' bug.

src/bot/index.js

@@ -390,20 +390,28 @@ export async function initBot(config, api, tools, skills, agents) {
 
       const msg = choice.message;
       if (msg.tool_calls?.length) {
-        const parts = [];
+        // Execute all tool calls, feed results back to AI for final answer
+        const toolMessages = [{ role: 'assistant', tool_calls: msg.tool_calls }];
         for (const tc of msg.tool_calls) {
           const fn = tc.function;
           try {
             const handler = toolHandlers[fn.name];
-            if (!handler) { parts.push(`❌ Unknown tool: ${fn.name}`); continue; }
+            if (!handler) {
+              toolMessages.push({ role: 'tool', tool_call_id: tc.id, content: `❌ Unknown tool: ${fn.name}` });
+              continue;
+            }
             const args = JSON.parse(fn.arguments);
+            logger.info(`🔧 ${fn.name}(${fn.arguments?.slice(0, 80)})`);
             const result = await handler(args);
-            parts.push(`${result}`);
+            toolMessages.push({ role: 'tool', tool_call_id: tc.id, content: String(result).slice(0, 4000) });
           } catch (e) {
-            parts.push(`❌ Tool ${fn.name} error: ${e.message}`);
+            toolMessages.push({ role: 'tool', tool_call_id: tc.id, content: `❌ Error: ${e.message}` });
           }
         }
-        return parts.join('\n\n');
+        // Ask AI to produce final text answer using tool results
+        const followUp = [...body.messages, ...toolMessages, { role: 'user', content: 'Based on the tool results above, provide your final answer.' }];
+        const followRes = await api.client.post('/chat/completions', { ...body, messages: followUp, tools: [] });
+        return followRes.data.choices?.[0]?.message?.content || '✅ Done.';
       }
       return msg.content || '✅ Done.';
     } catch (error) {