fix: split long messages for Telegram 4096 char limit

Bot crashed with "Message is too long" when sending full DP-00002 text
(8K+ chars). Now splits on paragraph boundaries. Also prevents silent
message drops from unhandled BadRequest exceptions.

Pentagon-Agent: Epimetheus <3D35839A-7722-4740-B93D-51157F7D5E70>

telegram/bot.py

@@ -720,7 +720,28 @@ IMPORTANT: Two special tags you can append at the end of your response (after yo
                 logger.info("Auto-research triggered: %s", query[:80])
 
     # Post response (without LEARNING lines)
-    await msg.reply_text(display_response)
+    # Telegram has a 4096 char limit — split long messages
+    if len(display_response) <= 4096:
+        await msg.reply_text(display_response)
+    else:
+        # Split on paragraph boundaries where possible
+        chunks = []
+        remaining = display_response
+        while remaining:
+            if len(remaining) <= 4096:
+                chunks.append(remaining)
+                break
+            # Find a good split point (paragraph break near 4000 chars)
+            split_at = remaining.rfind("\n\n", 0, 4000)
+            if split_at == -1:
+                split_at = remaining.rfind("\n", 0, 4096)
+            if split_at == -1:
+                split_at = 4096
+            chunks.append(remaining[:split_at])
+            remaining = remaining[split_at:].lstrip("\n")
+        for chunk in chunks:
+            if chunk.strip():
+                await msg.reply_text(chunk)
 
     # Update conversation state: reset window, store history (Ganymede+Rhea)
     if user: