Max/smolmix companions#6724
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Introduces mixtcp, a smoltcp-based device that tunnels TCP/IP through the mixnet via IpMixStream and Exit Gateway IPRs. Components: - NymIprDevice: smoltcp::phy::Device impl using channel-based I/O - NymIprBridge: async task bridging the device to IpMixStream - create_device(): helper to set up the complete stack Examples: - cloudflare_ping: ICMP ping through the mixnet - https_client: HTTPS requests through the mixnet - tls: TLS connections through the mixnet
- Drop sync NymIprDevice, create_device(), and raw/ examples
- Flatten src/tunnel/{mod,device}.rs into src/{tunnel,device}.rs
- Remove unused socket-icmp and proto-ipv6 smoltcp features
- Tighten bridge/device visibility to pub(crate)
- Fix silent error swallowing in handle_incoming() select branch - Remove cargo-cult 1s sleep before disconnect (SDK handles via TaskTracker) - Rename confusing bridge fields: tx_receiver/rx_sender -> outgoing_rx/incoming_tx - Document cancel-safety risk, drop-path shutdown, post-shutdown behavior - Add comment on error loop rate limiting (SDK's internal 10s timeout)
- Add src/ARCHITECTURE.md as single source of truth for architecture - Include in docs.rs via doc = include_str! - Strip duplicated diagrams from tunnel.rs, device.rs, README - Extract tls_connector() helper in HTTPS example to match websocket example - Use consistent 'smolmix' casing in README
- stream_wrapper::{IpMixStream, NetworkEnvironment} → ipr_wrapper::
- connect_tunnel() → check_connected()
- disconnect_stream() → disconnect()
- allocated_ips() returns &IpPair directly (no Option)
- Add Tunnel::new_with_ipr() for targeting a specific exit node - Re-export IpPair and Recipient so users don't need direct deps - Add DNS leak warning to WebSocket example - Await hyper connection task in HTTPS example
- Move core tunnel code to smolmix/core/ - Add smolmix-dns: hickory RuntimeProvider over tunnel - Add smolmix-tls: shared TLS connector extracted from hyper/tungstenite - Add smolmix-hyper: tower Service<Uri> connector for hyper-util - Add smolmix-tungstenite: WebSocket over TLS through tunnel - Add smolmix-libp2p: libp2p 0.56 Transport trait (dial-only) - Rewrite examples for each crate with clearnet/mixnet comparisons
- Explain TCP-layer vs message-layer design and why it matters - Document trait impls and I/O bridges for each companion crate - Add quick start, crate table, and example commands
- Replace stale stream_wrapper description with ipr_wrapper + mixnet::stream - Remove TODO comment
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