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• (dissolved) Host backends real

  Every nexum:host interface stops returning Unsupported and does real work behind the same WIT contract: alloy-backed chain with tower middleware (timeout, retry, rate-limit, fallback) and reconnecting subscriptions, redb-backed local-store with per-module byte quotas, real http fetch under the capability allowlist, keystore-backed identity signing, a Swarm/Bee remote-store, a Waku messaging client, and the logging sink routed through tracing. This is the first half of making the runtime real: the capabilities modules depend on become genuinely available. Acceptance: a module exercising chain reads, persisted state, an http fetch, and a signed action runs entirely on real backends with no Unsupported stubs on its path. Resequenced 2026-07: runs after grant delivery. Nothing in the grant requires these backends; the real identity backend (#52) gates the egress guard (M7).

  No due date

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