ci: use conformance composite action

[maxisbey]

Use the composite GitHub Action from modelcontextprotocol/conformance instead of manual npx scripts for running conformance tests.

Depends on: modelcontextprotocol/conformance#113

Changes:

• Replace pnpm run test:conformance:* with the composite action at modelcontextprotocol/conformance@<commit>
• Remove continue-on-error: true (replaced by expected-failures baseline mechanism)
• Add conformance-baseline.yml for tracking known failures per SDK
• Action builds from source at the referenced commit (no npm publish dependency)
• Pass node-version: 24 to match SDK requirements

Related PRs:

• Conformance repo: feat: add --expected-failures baseline and composite GitHub Action conformance#113
• Python SDK: ci: use conformance repo's composite GitHub Action python-sdk#1921

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commit: 4216a73

[maxisbey]

Open question for reviewers: This PR doesn't remove scripts/run-server-conformance.sh or the related package.json scripts (test:conformance:server, test:conformance:server:all, etc.). They're no longer used by CI but are still useful for local dev (pnpm run test:conformance:server).

Worth keeping for local convenience, or should we remove them and have devs run the conformance tool directly?

[maxisbey]

Open question for reviewers: This PR doesn't remove scripts/run-server-conformance.sh or the related package.json scripts (test:conformance:server, test:conformance:server:all, etc.). They're no longer used by CI but are still useful for local dev (pnpm run test:conformance:server).

Worth keeping for local convenience, or should we remove them and have devs run the conformance tool directly?

After discussing with @pcarleton , we'll leave this in for now and remove later once we add a helper subcommand to the conformance repo itself which can replace this script.