fix(eval): reject authored execution concurrency

[christso]

Summary

Authored eval YAML now rejects execution.max_concurrency and directs authors to evaluate_options.max_concurrency, matching the Promptfoo evaluateOptions.maxConcurrency convention while preserving .agentv/config.yaml execution.max_concurrency as operator run policy.

This also updates validator/parser tests, regenerated eval schema data, public v4.42.4 eval docs, and migration guidance so removed workers paths no longer send users back to the removed authored execution.max_concurrency surface.

Validation

• bun test packages/core/test/evaluation/loaders/config-loader.test.ts packages/core/test/evaluation/validation/eval-file-schema.test.ts packages/core/test/evaluation/validation/eval-validator.test.ts packages/core/test/evaluation/validation/eval-schema-sync.test.ts
• bun test packages/core/test/evaluation/eval-inline-experiment.test.ts packages/core/test/evaluation/config.test.ts
• bun run validate:examples
• bun run build
• bun run lint
• Manual red/green CLI validation:
  • execution.max_concurrency eval fails with guidance to evaluate_options.max_concurrency
  • evaluate_options.max_concurrency eval validates successfully

Live provider/grader dogfood was not run because this changes eval authoring validation/schema/docs only; it does not change provider execution, grader behavior, run artifacts, or result provenance.

Review Notes

• Promptfoo source evidence checked against local clone /home/entity/projects/promptfoo/promptfoo at 6bfc5a0c7f16f9c4717ac731d276b578e63d0769.
• Dedicated subagent review was skipped because the available Codex subagent tool requires explicit user authorization for delegation; inline simplify/review pass found no behavior-preserving follow-up changes.

Post-Deploy Monitoring & Validation

No additional production monitoring required. This is a local validation/schema/docs change with no service runtime path.

Expected healthy signals:

• CI build, lint, schema sync, and example validation pass.
• Users authoring evaluate_options.max_concurrency continue to validate and run.
• Users authoring execution.max_concurrency in eval YAML receive the new actionable validation error.

Failure signals and rollback trigger:

• CI schema sync or example validation fails.
• Valid eval files using evaluate_options.max_concurrency are rejected.
• .agentv/config.yaml execution.max_concurrency stops working as project/operator policy.

Validation window and owner: PR review and GitHub Actions before merge; coordinator owns Bead closure after merge.

Related

Related: av-kfik.23

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