Scaffold Rust workspace: warzone-protocol, server, client, mule

4 crates, all compile. 16/17 tests pass.

warzone-protocol (core crypto):
- Seed-based identity (Ed25519 + X25519 from 32-byte seed via HKDF)
- BIP39 mnemonic encode/decode (24 words)
- Fingerprint type (SHA-256 truncated, displayed as xxxx:xxxx:xxxx:xxxx)
- ChaCha20-Poly1305 AEAD encrypt/decrypt with random nonce
- HKDF-SHA256 key derivation
- Pre-key bundle generation with Ed25519 signatures
- X3DH key exchange (simplified, needs X25519 identity key in bundle)
- Double Ratchet: full implementation with DH ratchet, chain ratchet,
  out-of-order message handling via skipped keys cache
- Message format (WarzoneMessage envelope + RatchetHeader)
- Session type with ratchet state
- Storage trait definitions (PreKeyStore, SessionStore, MessageQueue)

warzone-server (axum):
- sled database (keys, messages, one-time pre-keys)
- Routes: /v1/health, /v1/keys/register, /v1/keys/{fp},
  /v1/messages/send, /v1/messages/poll/{fp}, /v1/messages/{id}/ack

warzone-client (CLI):
- `warzone init` — generate seed, show mnemonic, save to ~/.warzone/
- `warzone recover <words>` — restore from mnemonic
- `warzone info` — show fingerprint and keys
- Seed storage at ~/.warzone/identity.seed (600 perms)
- Stubs for send, recv, chat commands

warzone-mule: Phase 4 placeholder

Known issue: X3DH test fails (initiate/respond use different DH ops
due to missing X25519 identity key in bundle). Fix in next step.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/target/debug/.fingerprint/ed25519-dalek-4d68119233e207ac/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

warzone/target/debug/.fingerprint/ed25519-dalek-4d68119233e207ac/lib-ed25519_dalek

@@ -0,0 +1 @@
+5e194b02d837a6d8

warzone/target/debug/.fingerprint/ed25519-dalek-4d68119233e207ac/lib-ed25519_dalek.json

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+{"rustc":13850170861107434965,"features":"[\"alloc\", \"default\", \"fast\", \"rand_core\", \"serde\", \"std\", \"zeroize\"]","declared_features":"[\"alloc\", \"asm\", \"batch\", \"default\", \"digest\", \"fast\", \"hazmat\", \"legacy_compatibility\", \"merlin\", \"pem\", \"pkcs8\", \"rand_core\", \"serde\", \"signature\", \"std\", \"zeroize\"]","target":14975934594160758548,"profile":5347358027863023418,"path":4575084279225020293,"deps":[[9857275760291862238,"sha2",false,15702907384332128639],[12865141776541797048,"zeroize",false,8405835669083894354],[13548984313718623784,"serde",false,5498482491300739891],[13595581133353633439,"curve25519_dalek",false,317679226037091124],[14313198213031843936,"ed25519",false,8767052945251192380],[17003143334332120809,"subtle",false,15897404018854376665],[18130209639506977569,"rand_core",false,10919614123337114521]],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/ed25519-dalek-4d68119233e207ac/dep-lib-ed25519_dalek","checksum":false}}],"rustflags":[],"config":2069994364910194474,"compile_kind":0}