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>

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') {