Add opt-in protomux-rpc GUILD_SYNC_REQUEST pull when PEARCORD_RPC_WIRE=v2|dual
and PEARCORD_RPC_REQUEST_WIRE=1. Platform binds RPC responders on the mesh host,
joiner uses _tryGuildSyncRequestRpc with event-fanout fallback unchanged by default.
Includes mux-wire/gossip-request.js, live smoke, CI bundle test:ci-phase869, and
hardened dual-stack/v2 roundtrip smokes (bounded flush, longer timeouts). No
breaking change: default gossip event paths remain v1 unless env enables v2.
Raven Scott
727ef8c764