Brings RFC-003 to the canonical from-scratch spec for the in-server MCP surface:
a dedicated omnigraph-mcp transport crate + McpBackend trait (server -> mcp dep
to avoid a Cargo cycle), the verified rmcp 1.7 design (conformance MUSTs for
free), backend reuse (do_* / run_query / run_mutate / authorize / api), the
13-tool catalog + Cedar mapping, ParamKind -> JSON Schema, deny-masking +
isError split, two resources, per-graph routing (graphs_list stays REST-only),
auth + client-compat matrix + OAuth fast-follow, tests, and locked decisions.
Build the implementation on this branch from blueprint sections B.1-B.13. The
spec is informed by the #157 reference implementation.
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