EXPERIMENT (NOT FOR PRODUCTION YET)
Changes:
- KEEPALIVE_INTERVAL_SECONDS reduced from 20s to 5s
- Keepalive messages now show progress bar with dots: ●●●●○○○○○○
- Show elapsed time, total wait, and remaining seconds
- Example: ⏳ Waiting for instructions... ●●●●○○○○○○ 20s / 50s (agent=copilot, 30s remaining)
Goal: Test if more frequent progress updates provide better UX and prevent
perceived freezing during the 50s wait. No functional change - the
60s client timeout limit remains the binding constraint.