## Why
Closed WebSocket connections previously triggered immediate reconnects, and successful handshakes reset backoff even when connections were short-lived.
## What changed
- Delay automatic reconnects before token refresh or enrollment, and report `Connecting` while waiting.
- Use exponential backoff with jitter between half and all of the delay, starting at 5 seconds and capped at 30 seconds.
- Retain backoff across short-lived connections and reset it after a connection lasts at least 60 seconds.
- Interrupt the reconnect delay on shutdown, auth owner invalidation, or enable/disable changes, including an immediate disable/enable pair.
## Testing
Add connection tests for delayed token refresh, backoff retention and reset, explicit re-enabling, and prompt shutdown. Update retry tests to check jitter bounds, saturation during sustained failures, and backoff retention after a successful handshake.
GitOrigin-RevId: 0b9055ff64ff7d96f2d974b73ced8d4ffd02ac9e
cooper-oai
9d2b60303e