feat: M5 Prekey Server + M7 Wire Format
M5: Shade Prekey Server (Hono)
- REST API: register, fetch bundle, replenish, count, delete
- MemoryPrekeyStore for testing/embedded use
- Standalone Docker deployment (Dockerfile + standalone.ts)
- One-time prekey consumption on bundle fetch
M7: Compact binary wire format
- Version-tagged envelopes (PreKeyMessage, RatchetMessage)
- Length-prefixed byte arrays, big-endian integers
- Significantly smaller than JSON (no base64 bloat)
- Roundtrip encode/decode for all message types
100 tests, 0 failures across M1-M5+M7.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Sterister
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