feat(dht): Phase 2 engine — real iroh-blobs provider behind iroh-swarm

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Pulls iroh 1.0 + iroh-blobs 0.103 as OPTIONAL deps under the iroh-swarm
feature and implements a real BlobProvider over them. Verified: the full
iroh QUIC dep tree (260 pkgs) resolves and compiles against the pinned
bitcoin/nostr-sdk/reqwest-rustls stack; the provider compiles against the
0.103/1.0 API.

- swarm/iroh_provider.rs: IrohProvider::new binds a QUIC Endpoint, opens a
  persistent FsStore (data_dir/iroh-blobs), and serves blobs via the
  iroh-blobs protocol/Router — a node that fetches also SEEDS. try_fetch
  maps ContentDigest -> iroh Hash, asks discovery for seed EndpointIds, then
  downloader.download(hash, providers) (range-verified) + export to staging.
- ProviderDiscovery trait: the seam Phase 3 (signed Nostr advertisement
  events) fills. discovery=None -> no seeds -> origin-only, so enabling the
  feature is never worse than today.
- Default build untouched: iroh is optional, the module is cfg-gated, and
  providers() stays empty until Phase 3 wires discovery in.

Build: cargo build --features iroh-swarm succeeds (dev). Default build +
44 swarm/update/content_hash/blobs tests unchanged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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archipelago

2026-06-16 14:33:31 -04:00

co-authored by Claude Opus 4.8

parent 2523c9e3dd

commit 082946aa30

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