Prem Chaitanya Prathi d8bbef0c5b
feat(mix): bump libp2p stack to v2.0.0 + adopt stateless RLN spam protection
Combines five dep-and-build changes that all flow from the libp2p v2.0.0
upgrade and the move to the extracted libp2p_mix / mix-rln plugin stack:

waku.nimble:
  * libp2p: ff8d51857 -> c43199378 (release/v2.0.0 tip; sha-pinned until
    vacp2p cuts a v2.0.0 tag).
  * Drop the bare `zlib < 0.2` cap — no longer needed by the upgraded
    libp2p.
  * websock: bare ">= 0.4.0" — replaces the d4cd68b URL+SHA workaround
    that pinned through a libp2p commit-specific websock SHA.
  * nim-json-rpc: switch to chaitanyaprem/nim-json-rpc#f05fad25 — relaxes
    websock cap to allow >=0.4.0. TODO: revert to status-im/nim-json-rpc
    once status-im/nim-json-rpc#277 merges and a tag is cut.
  * lsquic: bare ">= 0.4.1" (drops URL form).
  * Add mix-rln-spam-protection-plugin pin (23b278b4) and nim-libp2p-mix
    pin (50c4ab4f — PR #14 HEAD); the plugin pins the same libp2p_mix
    SHA so the diamond dep collapses to a single source.

waku/factory/waku.nim:
  * Explicit HPService.setup(switch) / AutonatService.setup(switch)
    calls. libp2p v2.0.0's Service lifecycle refactor (libp2p#2462)
    removed switch.start's auto-setup loop, so any caller that assigns
    directly to switch.services (we do) is responsible for calling
    setup() themselves. Without it, AutonatService.addressMapper stays
    nil and peerInfo.expandAddrs SIGSEGVs during start(). Wrapped in
    try/except for ServiceSetupError so a setup failure surfaces as a
    logged error rather than a crash.

Build / scripts:
  * scripts/build_rln_mix.sh removed and Makefile simplified — librln
    is now a single shared archive built from zerokit's `stateless`
    features (no separate librln_mix archive).
  * simulations/mixnet/build_setup.sh + setup_credentials.nim updated
    to use librln_v2.0.2.a directly and run RLN keystore setup before
    nodes start.

Validated:
  * Cold local-cache nimble setup --localdeps -y.
  * wakunode2 and chat2mix link cleanly.
  * Mixnet roundtrip sim: [PASS] bob received message from alice.
  * RLN proof generation + verification on every in-path mix node:
    5 gen_called == 5 verified, 0 SPAM_PROOF_* errors.
2026-06-04 16:54:44 +05:30
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