v4.19.0

What's Changed

• refactor(core): rename Evaluator to Grader across codebase by @christso in #1111
• feat(cli): incremental eval runs — resume, append, and aggregate by @christso in #1110
• feat(core): rename total_budget_usd to budget_usd by @christso in #1117
• feat(core): add beforeAll, budgetUsd, turns, aggregation to programmatic API by @christso in #1119
• feat(cli): add *.eval.ts auto-discovery by @christso in #1120

Full Changelog: v4.17.1...v4.19.0