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bcd0d9c867
Add the `omnigraph-mcp` crate (stateless Streamable-HTTP transport, `McpBackend`
seam, fail-closed Host/Origin policy) and the server backend projecting built-in
operations and the per-graph stored-query registry as MCP tools + resources over
`POST /graphs/{id}/mcp`. Every tool delegates to the same engine/handler
functions the REST routes use and is gated by the same Cedar `authorize` path;
reads/writes carry structured output.
Includes three correctness fixes from review + live testing:
- tools/list is a faithful relaxation of the per-call gate: a built-in whose
authorization depends on a caller-chosen branch is shown iff the actor could
invoke it on some branch, via PolicyEngine::permits_on_any_branch (capability
probe through the same Cedar authorizer). A fabricated-`main` probe wrongly
hid graph_mutate under the canonical "protect main, write unprotected" policy.
- The stored-query surface honors mode + `expose` on call as well as on list:
resolve_stored_tool is the single membership test, so the meta pair
(stored_query_list/stored_query_run) is callable only in `meta` mode and
stored_query_run resolves exposed-only. An `expose:false` query is unreachable
by name on the agent surface (it stays HTTP/service-callable).
- The loopback Host allow-list is the full set [127.0.0.1, ::1, localhost]
(matches rmcp's default), so an IPv6 loopback `Host: [::1]` is accepted
regardless of which stack the server bound.
The protocol-version contract is documented (initialize negotiates the version
in its body, so the MCP-Protocol-Version header is validated on non-init
requests only) and pinned by a test.
Tests: omnigraph-mcp/tests/standalone.rs, omnigraph-server/tests/mcp.rs,
omnigraph-policy permits_on_any_branch unit test, omnigraph-api-types schema
projection. Full workspace gate green.
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