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Johnathan Corgan
5d190885ec
Add comprehensive design doc for FIPS protocol message flow covering: - DNS-based identity cache priming (npub.fips format) - TUN reader processing pipeline - Crypto session (Noise KK with secp256k1) vs routing session distinction - Combined establishment model (routing + crypto in single round-trip) - Noise KK pattern with ChaCha20-Poly1305, AEAD-only authentication - Route discovery via bloom filters and LookupRequest flooding - Crossing hellos handling with deterministic tie-breaker (lower npub wins) Includes reconciliation section tracking alignment with existing design docs (fips-routing.md terminology updates pending).