feat(config): lower scenarios into tests

[christso]

Summary

AgentV can now load Promptfoo-style scenarios as a pre-expansion matrix helper: each scenario config row is lowered with each scenario test row into ordinary AgentV tests before the normal prompts x tests x targets expansion.

This keeps scenarios as authoring sugar rather than a new run artifact or grouping model. providerPromptMap and provider_prompt_map remain rejected because prompt selection should stay explicit through AgentV prompts, targets, files, tags, and CLI selection rather than Promptfoo provider identity baggage.

Validation

After rebasing this stack onto merged PR #1690 and the alias-removal branch:

• bun test packages/core/test/evaluation/validation/eval-file-schema.test.ts packages/core/test/evaluation/validation/eval-validator.test.ts packages/core/test/evaluation/loaders/jsonl-parser.test.ts packages/core/test/evaluation/validation/eval-schema-sync.test.ts
• bun --filter @agentv/core typecheck
• bun --filter @agentv/core lint
• bun --filter @agentv/core build

The worker also regenerated skills-data/agentv-eval-writer/references/eval.schema.json and verified the pinned Promptfoo clone at 6bfc5a0c7f16f9c4717ac731d276b578e63d0769.

Live provider dogfood is deferred to the final docs/examples pass (av-kfik.16) because this PR changes deterministic schema/validation/loading and does not alter provider/grader adapter behavior or run artifact contracts.

Related

Related: av-kfik.50
Depends on: #1691

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