[SYS-031] /ultrareview not available over Remote Control — hard block, no fallback

Summary

Running /ultrareview <PR> from the Claude mobile app via Remote Control returns:

/ultrareview isn't available over Remote Control.

No fallback, no suggestion to run from desktop, no documentation warning.

Reproduction

1. Connect Claude mobile app via Remote Control (/remote-control)
2. Send /ultrareview 2 from mobile
3. Hard error: '/ultrareview isn't available over Remote Control.'

Impact

Remote Control is explicitly designed for mobile-driven workflows. Excluding a major skill from it with no fallback or explanation defeats the purpose. Particularly painful when Desktop compact is broken (forces RC use) and you want to kick off a review while away from desk.

Expected behavior

Either: (a) allow ultrareview to queue/run from RC with a notification when done, or (b) at minimum respond with 'Run this from your desktop terminal: /ultrareview 2' instead of a hard block.

Environment

• Claude Code v2.1.111
• Claude iOS mobile app via Remote Control