v0.64.0

Added

• Added an official typed TypeScript/JavaScript WebSocket client in clients/js
  (npm @anulum/synapse-channel). Unlike the read-only Go client it speaks the
  mutation protocol — chat, claims, releases, board reads, presence, and receipts
  — with typed envelopes, a connect/welcome handshake, keepalive heartbeats, and
  inbound dispatch by message type. It runs unchanged in the browser and in
  Node 20+ with no runtime dependencies, is verified by a dedicated CI job, and
  is a separate package that does not ship inside the Python distribution.