Rebrand the entire project with a memorable phonetic name:
- Update package and binary name in Cargo.toml
- Change config directory from ~/.config/mpv-mgr to ~/.config/empeve
- Rename MpvMgrError to EmpveError
- Update all CLI help text and user-facing messages
- Update README title and documentation
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>