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/darling_core-bc562aba2252feea/invoked.timestamp

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

warzone/target/debug/.fingerprint/darling_core-bc562aba2252feea/lib-darling_core

@@ -0,0 +1 @@
+3af653571151a053

warzone/target/debug/.fingerprint/darling_core-bc562aba2252feea/lib-darling_core.json

@@ -0,0 +1 @@
+{"rustc":13850170861107434965,"features":"[\"strsim\", \"suggestions\"]","declared_features":"[\"diagnostics\", \"serde\", \"strsim\", \"suggestions\"]","target":13428977600034985537,"profile":3033921117576893,"path":1609774975456582016,"deps":[[4289358735036141001,"proc_macro2",false,18362539423673856587],[10420560437213941093,"syn",false,5960018906410477822],[11166530783118767604,"strsim",false,14405121623040787041],[13111758008314797071,"quote",false,16255256810892878592],[15383437925411509181,"ident_case",false,12620530547401121424]],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/darling_core-bc562aba2252feea/dep-lib-darling_core","checksum":false}}],"rustflags":[],"config":2069994364910194474,"compile_kind":0}