stage-7: CLI tool with full subcommands

echo status/doctor/restart/logs/sessions/channel/send commands, symlink at ~/.local/bin/echo. QA fix: discord chat handler tuple unpacking bug. 32 new tests (193 total).

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

src/adapters/discord_bot.py

@@ -4,8 +4,6 @@ import asyncio
 import logging
 import os
 import signal
-from pathlib import Path
-
 import discord
 from discord import app_commands
 
@@ -355,7 +353,7 @@ def create_bot(config: Config) -> discord.Client:
 
         try:
             async with message.channel.typing():
-                response = await asyncio.to_thread(
+                response, _is_cmd = await asyncio.to_thread(
                     route_message, channel_id, user_id, text
                 )
 

src/router.py

@@ -64,7 +64,7 @@ def route_message(channel_id: str, user_id: str, text: str, model: str | None =
         response = send_message(channel_id, text, model=model)
         return response, False
     except Exception as e:
-        log.error(f"Claude error for channel {channel_id}: {e}")
+        log.error("Claude error for channel %s: %s", channel_id, e)
         return f"Error: {e}", False