Add Platform consumer kit adopter fixture

[haasonsaas]

Summary

• document Kestrel's EvalOps adopter inventory for the Platform Consumer Kit
• add a non-Kestrel Node agent adopter fixture that builds a scoped client config and conformance score
• wire the fixture typecheck into SDK publish/build scripts

Verification

• npm --prefix sdk/js run typecheck:examples
• npm --prefix sdk/js run build
• npm run sdk:build
• npm --prefix sdk/js run pack:dry

Closes #57

[cursor]

PR Summary

Low Risk
Low risk: adds documentation and an example adopter fixture, plus extra TypeScript typechecking during SDK build/publish which may only surface previously unnoticed type errors.

Overview
Documents Kestrel’s Platform Consumer Kit “adopter inventory” in the JS SDK README and adds a second adopter fixture (examples/node-agent-adopter.ts) that builds a scoped consumer config and validates required capability conformance.

Updates SDK build/publish workflows to typecheck the new examples tree (tsconfig.examples.json), includes examples in the npm package, and wires the example typecheck into the root sdk:build script and SDK prepublishOnly.

^{Reviewed by Cursor Bugbot for commit c3ea316. Bugbot is set up for automated code reviews on this repo. Configure here.}