Integrate logos-chat with the LEZ-backed mix network:
- Update vendor/nwaku to logos-delivery fork (feat/mix-rln-gifter-sim)
with mix protocol, OnchainLEZGroupManager, RLN gifter client, and
mix-rln-spam-protection-plugin
- Add vendor/logos-lez-rln submodule for reproducible LEZ module builds
- Add RLN FFI surface to liblogoschat: chat_set_rln_fetcher,
chat_set_rln_config, chat_push_roots, chat_push_proof, etc.
- Wire gifter client for RLN membership registration via mix network
- Switch to filter-based message reception (relay: false, filter: true)
- Send via lightpushPublish(mixify=true) for Sphinx onion routing
- Add mix-librln separate build + duplicate symbol resolution
- Exclude vendor/logos-lez-rln from nimble link creation
- Update nix build for mix-librln and cross-platform support
Add rust-bundle, a single staticlib crate that depends on both libchat
and rln as rlibs. This ensures rustc links Rust std exactly once,
eliminating duplicate symbol errors on all platforms. Nim targets link
against liblogos_chat_bundle.a; Nix uses a bundleDrv instead of
separate libchat and rln derivations.
Reference: https://doc.rust-lang.org/reference/linkage.html#mixed-rust-and-foreign-codebases
