feat: chasqui standalone — descubrimiento + transporte P2P soberano (DHT, relay, NAT traversal) (front-door, git-dep al monorepo)

Front-door limpio: solo crates del dominio; Llimphi y lo fundacional por
git-dep del monorepo gioser.git. cargo check pasa (8 crates, 0 errores).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

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+# chasqui
+
+> Sovereign peer discovery + transport — DHT, relay, NAT traversal — in Rust.
+
+`chasqui` (Quechua: *Inca relay messenger*) is the networking layer: peer discovery (UDP + Kademlia DHT), relay/dcutr/autonat for NAT traversal, and authenticated transport over the `card` identity. Channels and capabilities are expressed as typed cards; no TCP/IP assumptions leak into the apps above it.
+
+## How dependencies work
+Front-door repo: only `chasqui-*` crates here. `card` (identity), `arje` primitives, shared leaves are git-dependencies of the [`gioser`](https://gitea.gioser.net/sergio/gioser) monorepo.
+
+## License
+MIT. Part of the [gioser](https://gitea.gioser.net/sergio/gioser) suite.