v0.65.0

Added

• Added an outbound MCP client so a Synapse operator can call tools on an
  external MCP server, the independent counterpart to the inbound synapse mcp
  server. synapse mcp-tools <server> --config <file> lists and synapse mcp-call <server> <tool> --config <file> --arg k=v invokes tools named in a
  deny-by-default JSON allowlist — a server or tool that is not allowlisted is
  refused before the server is contacted. Uses the optional synapse-channel[mcp]
  extra, imported only when a call is made. Per-agent ACLs over outbound MCP
  remain a later tranche.