feat(mcp): let agents send tasks to another connected computer

[sheehanmunim]

Summary

• Agents can call computer_list / computer_send to start a new thread on another computer this MT Code client already knows about (this machine, SSH, T3 Connect, or paired LAN).
• Same-machine send is handled on the server; cross-machine send is brokered by the desktop, web, or mobile app so the current chat is not moved and the transcript is not shared.
• Codex is instructed to use these tools instead of asking the user to switch Run on.

Test plan

• Open MT Code with a local environment plus an SSH/T3 Connect/paired computer
• In a chat on one machine, ask the agent to do work that belongs on the other (different OS, files, or desktop)
• Confirm it lists computers, starts a new thread on the target, and the original chat stays put
• Confirm an offline SSH host is woken the same way as Run on
• Keep the app open during the send so the client can broker it

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