Remove unused muse CLI command
The sol muse command was a user-facing wrapper for running agents that
was never documented or integrated into workflows. All agent execution
goes through Cortex (via cortex_request) or the web UI instead.
- Delete muse/cli.py (372 lines)
- Remove "muse" from COMMANDS and GROUPS in sol.py
- Remove "muse" from critical commands test
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>