- Add Connection.hs with ConnectionState type and upgrade detection
- Add Tunnel.hs for bidirectional WebSocket tunneling via responseRaw
- Update Proxy.hs to detect WebSocket upgrades and route to tunnel mode
- Fix request body forwarding (was previously empty)
- Add network, streaming-commons, splice dependencies
- Add WebSocket/SSE test servers in examples/websockets/
WebSocket + regular HTTP now work simultaneously without conflicts.
SSE streaming support pending (Milestone 1.6).
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