The reset-conversation CLI command was reading/writing the agent JSON file directly, missing the per-channel conversations map introduced with conversation routing. Now uses Store.clearConversation() which clears both the legacy conversationId and all per-channel conversation keys.
Also adds multi-agent awareness: prompts which agent to reset when multiple agents are configured.
Closes#316
Written by Cameron and Letta Code
"Debugging is twice as hard as writing the code in the first place." -- Brian Kernighan