Wires the existing mix_lez_chat simulation to drive the gifter's
EIP-191 allowlist auth path end-to-end:
* bumps vendor/nwaku and vendor/logos-lez-rln (and, transitively,
logos-delivery-module and its bundled logos-delivery copy) to pick up
the auth plugin, the auto-registering client's EIP-191 signing, and
the new --mix-gifter-allowlist / --mix-gifter-auth-key CLI flags.
* adds a `gifterAuthKey` knob on WakuConfig + the JSON config bridge in
client_api so chat sender/receiver instances sign their gifter
requests too.
* commits 5 fixed test secp256k1 keys (one per non-gifter mix node and
per chat client) under simulations/mix_lez_chat/fixtures/gifter_auth/
along with their derived addresses.
* run_simulation.sh sources keys.env+addresses.env, sets
`mixGifterAllowlist` on mix node 0, and threads the matching
`mixGifterAuthKey` / `gifterAuthKey` into nodes 1-3 and the
receiver/sender configs.
Test fixtures only — keys must never be reused outside this sim.
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
