feat(sdk-runner): add rust-sdk to KNOWN_SDKS#419
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The mcp-conformance package's fixture bins follow the harness contract directly (URL argv + MCP_CONFORMANCE_SCENARIO env), and the server selects the SEP-2575 stateless lifecycle via STATELESS=1. Requires the repo's pinned Rust toolchain (rustup installs it on demand).
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Adds
rust-sdktoKNOWN_SDKS(follow-up to #417): themcp-conformancepackage'sconformance-client/conformance-serverbins follow the harness contract directly (server URL argv +MCP_CONFORMANCE_SCENARIOenv), so no command bridging is needed. The server readsPORTandSTATELESSfrom the environment; the entry defaults to the stateful lifecycle athttp://localhost:3000/mcp, and a 2026-07-28 run overrides--server-cmd 'STATELESS=1 PORT=3000 ./target/debug/conformance-server'(documented in the entry comment).Verified end-to-end:
conformance sdk rust-sdk --mode client --suite all --spec-version 2026-07-28→ 333/336 checks (30/32 scenarios),--mode serverwith the stateless override → 112/113 checks (39/40 scenarios). The remaining failures are the pre-spec-#3002 discover shape (tools_call, oneserver-statelesscheck) plus SEP-2350 scope-step-up.