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/sled-0471ef66a96013ce/invoked.timestamp

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

warzone/target/debug/.fingerprint/sled-0471ef66a96013ce/lib-sled

@@ -0,0 +1 @@
+bf80fcec9963ccb6

warzone/target/debug/.fingerprint/sled-0471ef66a96013ce/lib-sled.json

@@ -0,0 +1 @@
+{"rustc":13850170861107434965,"features":"[\"default\", \"no_metrics\"]","declared_features":"[\"backtrace\", \"color-backtrace\", \"compression\", \"default\", \"docs\", \"event_log\", \"failpoints\", \"io_uring\", \"lock_free_delays\", \"measure_allocs\", \"miri_optimizations\", \"mutex\", \"no_inline\", \"no_logs\", \"no_metrics\", \"pretty_backtrace\", \"rio\", \"testing\", \"zstd\"]","target":3855776470257171463,"profile":8276155916380437441,"path":2600632971717299881,"deps":[[3528074118530651198,"crossbeam_epoch",false,14822919492090804640],[4468123440088164316,"crossbeam_utils",false,3796221186743118623],[7312356825837975969,"crc32fast",false,139427570642940846],[7521345276086848634,"fxhash",false,13524450292735726972],[8128303468064674118,"fs2",false,12775808366137699791],[10630857666389190470,"log",false,15245802057776188872],[11641406201058336332,"parking_lot",false,5952611078894740111],[17159683253194042242,"libc",false,9230993854736540384]],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/sled-0471ef66a96013ce/dep-lib-sled","checksum":false}}],"rustflags":[],"config":2069994364910194474,"compile_kind":0}