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.