SunandRiver

fix(tui): add retry backoff for event subscription to prevent CPU spin

4

## Problem When the server shuts down unexpectedly, the TUI attach client enters a tight retry loop causing 100% CPU usage. This happens because the event subscription loop in `sdk.tsx`...

TUI client CPU 100% when server shuts down

1

Problem: TUI client goes into tight retry loop causing CPU 100% when server is killed. Repro: 1. Run opencode spawn 2. Kill server process 3. Attach client spins CPU at...