…nd implementation plan

…ing corrections, tokio version bump, and test impact clarifications

…heartbeat timeout

- Add heartbeat timeout to client control connection using server heartbeats for dead connection detection
- Introduce exponential backoff with jitter for reconnection delays
- Add CLI flags: --no-reconnect to disable auto-reconnect, --max-reconnect-delay to configure backoff cap
- Classify authentication errors as fatal (never retried), all others retried automatically
- Configure TCP keepalive on control connections for OS-level dead connection detection
- Update documentation (README.md, CLAUDE.md) to describe reconnection behavior and new flags
- Add unit tests for backoff logic and error classification

…nd improve logging

…live

- Add explicit notes to authentication error messages to clarify their use in fatal error classification
- Update client and server to log a warning instead of failing if TCP keepalive cannot be set
- Refine no_reconnect mode to exit cleanly on disconnect and fail on authentication errors
- Enforce minimum value for max_reconnect_delay CLI argument

… and error classification details

…ntainer Registry support

… .ck directory

…et handling