Captures the verified 2026-06-16 design: swarm-assist/origin-always-wins,
iroh-blobs as the swarm engine, BLAKE3 addressing, signed Nostr/release-root
authenticity, and the Phase 0-4 plan. Foundation doc for the dht branch.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
