Major WebSocket handler refactor:
- Rewrite ws/handler.go with structured message routing and backpressure
- Add connection lifecycle management with heartbeats and timeouts
- Implement graceful connection draining for zero-downtime restarts
Protocol improvements:
- Define structured protocol types in protocol.go for hub communication
- Add versioned message envelopes for backward compatibility
- Standardize error codes and response formats across WebSocket API
Job streaming via WebSocket:
- Simplify ws/jobs.go with async job status streaming
- Add compression for high-volume job updates
Testing:
- Update websocket_e2e_test.go for new protocol semantics
- Add connection resilience tests
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