Feature request: support the oh-my-pi harness (can1357/oh-my-pi) #6

Summary

Spynel currently supports external coding harnesses such as pi and claude-code. Please consider adding support for oh-my-pi (https://github.com/can1357/oh-my-pi), a coding agent in the pi family described as "Coding agent with the IDE wired in".

Why

• Users who prefer oh-my-pi as their daily driver agent currently cannot select it as a Spynel harness and must fall back to vanilla pi or another supported harness.
• Since it is closely related to the existing pi harness, adaptation may be small (similar stream/session model), making this a potentially low-cost addition.

Suggested behavior

• New harness.name option (e.g. oh-my-pi) alongside existing harnesses.
• Session mapping, dispatch, recovery, and /model / /config integration consistent with the existing pi harness handling.

Environment

• Spynel installed via npm on macOS (arm64), harness currently set to pi.

Thanks for a great tool!