Shade

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Sterister a60ff9d6e8 feat: M4 Session Manager + demo

ShadeSessionManager wraps X3DH + Double Ratchet into a simple API:
- initialize(), createPreKeyBundle(), encrypt(), decrypt()
- Automatic PreKeyMessage for first message, RatchetMessage after
- Signed prekey rotation, multi-peer sessions, one-time prekey mgmt
- Interactive demo.ts showing full frontend↔backend E2EE flow

80 tests, 0 failures across M1-M4.

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

2026-04-09 20:12:01 +02:00