Add rea mcp --http [--host] [--port]: the same server rea speaks over stdio,
served over MCP Streamable HTTP on a loopback listener by default, using the
SDK's web-standard transport already in the pinned @modelcontextprotocol/server
behind a small node:http bridge. One client and one session at a time; DELETE
ends the session without running provider teardown, a new client's initialize
replaces a session left open, foreign Host headers are refused on loopback
binds, and shutdown is signals-only. Stdio stays the default and registered
transport; server.json and client registrations are unchanged.
Refs morluto/rea#4933
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
