v2.0.7

Always import traces for eval runs (#194)

## Summary
- always scaffold and populate the Trace column for evaluations
- remove scorer-dependent trace gating and the unused batch-row path
- remove obsolete trace-reference helpers and bump the SDK to 2.0.7

## Test plan
- [x] `npm test -- --run src/evals.test.ts
src/evaluations/scorers/scorers.test.ts src/evaluations/columns.test.ts`
- [x] `npm run lint`
- [x] `npm run build`

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