[aw] Add trusted KBE search eval support

[vitek-karas]

Summary

• Add the repository-scoped KBE issue-search wrapper used by the CI scanner eval.
• Add the candidate-read grader and focused Node tests.
• Provision these evaluator inputs from the trusted base checkout and wire the focused test and grader into the eval runner.

Role in the stacked change

This is the prerequisite for dotnet/runtime#133684. It must merge before #133684 so the trusted evaluator files are available from main. The /ci-eval workflow restores evaluator inputs from main before checking out a pull request; without these files on main, the dependent PR's wrapper, grader, and focused tests cannot be trusted or exercised by the evaluator.

After this PR merges, #133684 can retain the production workflow, instruction, and eval-spec changes that consume this support.

Validation

• node --test .github/workflows/evals/kbe-search.test.mjs — 10 tests passed.
• git diff --check passed.

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