MCP server (stdio + HTTP/SSE) for trusty-memory.
Why: Claude Code and other MCP-aware clients integrate with trusty-memory
through the standardized Model Context Protocol; we expose memory + KG
tools so they can be called by name.
What: Provides run_stdio (JSON-RPC 2.0 over stdin/stdout) and run_http
(axum HTTP/SSE stub), plus an AppState that carries the shared
PalaceRegistry, on-disk data root, and a lazily-initialized embedder.
Test: cargo test -p trusty-memory-mcp validates handshake + dispatch.