feat(cluster): RFC 010 c1 — cluster feature flag + optional serde/postcard deps

Off by default; the default build stays libc-only. serde (payload contract)
and postcard (payload codec) are optional, no default features. src/cluster.rs
is an intentionally empty cfg-gated stub so the flag's default-build
invariance is reviewable in isolation.
This commit is contained in:
Claude
2026-08-14 13:20:20 +00:00
parent ca1c98336e
commit 58a2fe3046
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//! RFC 010 — clustering (smarm⇄smarm, explicit remote boundary).
//!
//! c1: feature flag + optional deps only. The owned envelope (c2), transport
//! trait (c3), and everything above them land in later chunks. This module is
//! intentionally empty so the `cluster` feature's default-build invariance is
//! reviewable in isolation.