feat(whatsapp): consolidate tool progress into single editable message

Instead of sending a separate WhatsApp message for each tool call during
agent execution (N+1 messages), the first tool sends a new message and
subsequent tools edit it to append their line. Result: 1 growing progress
message + 1 final response = 2 messages instead of N+1.

Changes:
- bridge.js: Add POST /edit endpoint using Baileys message editing
- base.py: Add optional edit_message() to BasePlatformAdapter (no-op
  default, so platforms without editing support work unchanged)
- whatsapp.py: Implement edit_message() calling bridge /edit
- run.py: Rewrite send_progress_messages() to accumulate tool lines and
  edit the progress message. Falls back to sending a new message if
  edit fails (graceful degradation).

Before (5 tools = 6 messages):
  ⚕ Hermes Agent ─── 🔍 web_search... "query"
  ⚕ Hermes Agent ─── 📄 web_extract... "url"
  ⚕ Hermes Agent ─── 💻 terminal... "pip install"
  ⚕ Hermes Agent ─── ✍️ write_file... "app.py"
  ⚕ Hermes Agent ─── 💻 terminal... "python app.py"
  ⚕ Hermes Agent ─── Done! The server is running...

After (5 tools = 2 messages):
  ⚕ Hermes Agent ───
  🔍 web_search... "query"
  📄 web_extract... "url"
  💻 terminal... "pip install"
  ✍️ write_file... "app.py"
  💻 terminal... "python app.py"

  ⚕ Hermes Agent ─── Done! The server is running...

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

gateway/platforms/base.py

@@ -398,7 +398,20 @@ class BasePlatformAdapter(ABC):
             SendResult with success status and message ID
         """
         pass
-    
+
+    async def edit_message(
+        self,
+        chat_id: str,
+        message_id: str,
+        content: str,
+    ) -> SendResult:
+        """
+        Edit a previously sent message. Optional — platforms that don't
+        support editing return success=False and callers fall back to
+        sending a new message.
+        """
+        return SendResult(success=False, error="Not supported")
+
     async def send_typing(self, chat_id: str) -> None:
         """
         Send a typing indicator.

gateway/platforms/whatsapp.py

@@ -351,7 +351,36 @@ class WhatsAppAdapter(BasePlatformAdapter):
             )
         except Exception as e:
             return SendResult(success=False, error=str(e))
-    
+
+    async def edit_message(
+        self,
+        chat_id: str,
+        message_id: str,
+        content: str,
+    ) -> SendResult:
+        """Edit a previously sent message via the WhatsApp bridge."""
+        if not self._running:
+            return SendResult(success=False, error="Not connected")
+        try:
+            import aiohttp
+            async with aiohttp.ClientSession() as session:
+                async with session.post(
+                    f"http://localhost:{self._bridge_port}/edit",
+                    json={
+                        "chatId": chat_id,
+                        "messageId": message_id,
+                        "message": content,
+                    },
+                    timeout=aiohttp.ClientTimeout(total=15)
+                ) as resp:
+                    if resp.status == 200:
+                        return SendResult(success=True, message_id=message_id)
+                    else:
+                        error = await resp.text()
+                        return SendResult(success=False, error=error)
+        except Exception as e:
+            return SendResult(success=False, error=str(e))
+
     async def send_typing(self, chat_id: str) -> None:
         """Send typing indicator via bridge."""
         if not self._running:

gateway/run.py

@@ -1939,32 +1939,67 @@ class GatewayRunner:
             progress_queue.put(msg)
         
         # Background task to send progress messages
+        # Accumulates tool lines into a single message that gets edited
         async def send_progress_messages():
             if not progress_queue:
                 return
-            
+
             adapter = self.adapters.get(source.platform)
             if not adapter:
                 return
-            
+
+            progress_lines = []      # Accumulated tool lines
+            progress_msg_id = None   # ID of the progress message to edit
+
             while True:
                 try:
-                    # Non-blocking check with small timeout
                     msg = progress_queue.get_nowait()
-                    await adapter.send(chat_id=source.chat_id, content=msg)
-                    # Restore typing indicator after sending progress message
+                    progress_lines.append(msg)
+                    full_text = "\n".join(progress_lines)
+
+                    if progress_msg_id is None:
+                        # First tool: send as new message
+                        result = await adapter.send(chat_id=source.chat_id, content=full_text)
+                        if result.success and result.message_id:
+                            progress_msg_id = result.message_id
+                    else:
+                        # Subsequent tools: try to edit, fall back to new message
+                        result = await adapter.edit_message(
+                            chat_id=source.chat_id,
+                            message_id=progress_msg_id,
+                            content=full_text,
+                        )
+                        if not result.success:
+                            # Edit failed — send as new message and track it
+                            result = await adapter.send(chat_id=source.chat_id, content=full_text)
+                            if result.success and result.message_id:
+                                progress_msg_id = result.message_id
+
+                    # Restore typing indicator
                     await asyncio.sleep(0.3)
                     await adapter.send_typing(source.chat_id)
+
                 except queue.Empty:
-                    await asyncio.sleep(0.3)  # Check again soon
+                    await asyncio.sleep(0.3)
                 except asyncio.CancelledError:
-                    # Drain remaining messages
+                    # Drain remaining queued messages
                     while not progress_queue.empty():
                         try:
                             msg = progress_queue.get_nowait()
-                            await adapter.send(chat_id=source.chat_id, content=msg)
+                            progress_lines.append(msg)
                         except Exception:
                             break
+                    # Final edit with all remaining tools
+                    if progress_lines and progress_msg_id:
+                        full_text = "\n".join(progress_lines)
+                        try:
+                            await adapter.edit_message(
+                                chat_id=source.chat_id,
+                                message_id=progress_msg_id,
+                                content=full_text,
+                            )
+                        except Exception:
+                            pass
                     return
                 except Exception as e:
                     logger.error("Progress message error: %s", e)

scripts/whatsapp-bridge/bridge.js

@@ -8,6 +8,7 @@
  * Endpoints (matches gateway/platforms/whatsapp.py expectations):
  *   GET  /messages       - Long-poll for new incoming messages
  *   POST /send           - Send a message { chatId, message, replyTo? }
+ *   POST /edit           - Edit a sent message { chatId, messageId, message }
  *   POST /typing         - Send typing indicator { chatId }
  *   GET  /chat/:id       - Get chat info
  *   GET  /health         - Health check
@@ -216,6 +217,27 @@ app.post('/send', async (req, res) => {
   }
 });
 
+// Edit a previously sent message
+app.post('/edit', async (req, res) => {
+  if (!sock || connectionState !== 'connected') {
+    return res.status(503).json({ error: 'Not connected to WhatsApp' });
+  }
+
+  const { chatId, messageId, message } = req.body;
+  if (!chatId || !messageId || !message) {
+    return res.status(400).json({ error: 'chatId, messageId, and message are required' });
+  }
+
+  try {
+    const prefixed = `⚕ *Hermes Agent*\n────────────\n${message}`;
+    const key = { id: messageId, fromMe: true, remoteJid: chatId };
+    await sock.sendMessage(chatId, { text: prefixed, edit: key });
+    res.json({ success: true });
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
 // Typing indicator
 app.post('/typing', async (req, res) => {
   if (!sock || connectionState !== 'connected') {