fix: add retry logic for simulator TCP connections

## Summary
\`sendRemoteCommand\` fails immediately on timeout. Should retry 2-3x with backoff — simulator may be in the middle of loading/rendering.

**Status: Implemented** — retries up to 3x with incremental backoff (500ms, 1s, 1.5s). Skips retry on ECONNREFUSED (simulator not running).

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