Add src/lib/cordn/native/ — a browser-safe Cordn client doing real RFC 9420
MLS over a ContextVM coordinator, mirroring Cordn's wire contract (reimplemented,
not copied from @cordn/cli).
- mls.ts: identity, key packages, group create/add/join, application messages,
the ChaCha20-Poly1305 coordinator wrapper, causal prev tags.
- coordinator.ts: ContextVM/MCP-over-Nostr client on @contextvm/sdk, validated
with @cordn/core schemas.
- session.ts: CordnSession (key packages, createGroup, addMember->Welcome,
joinGroup, send, fetch) with persistence behind an injectable CordnStore
(MemoryCordnStore today; IndexedDB adapter TODO).
- Verified end-to-end against our own coordinator: a two-member round trip
(CORDN_LIVE=1 vitest run native.live.test.ts) — create, add, join, and
bidirectional encrypted messages with proven senders.
Deps: @cordn/core, @contextvm/mcp-sdk, @noble/ciphers pinned 2.2.0 (fixes the
previously invalid tree: ts-mls wants 2.2.0, a stale root copy was 0.5.3).
src/test/setup.ts is now guarded for node-environment test files. Not wired to
any UI yet; nothing imports the module, so the web bundle is unchanged.
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