Complete hard-deprecation codemod migrations

[christso]

Summary

Completes the remaining Promptfoo-aligned hard-deprecation codemod pass for av-kfik.15.2.

• Generalizes the direct-input codemod into migrate-hard-deprecations and covers concurrency placement, env template syntax, preprocessors/postprocess, artifact path keys, and workspace isolation vocabulary.
• Hard-rejects removed authored keys with transform/evaluate_options guidance in schema, validator, YAML parser, target validation, and target runtime env handling.
• Migrates repo-owned examples/templates/current docs to {{ env.* }}, evaluate_options.max_concurrency, workspace.scope, and Promptfoo-compatible transform.
• Refreshes the eval-writer schema and updates focused tests for codemod output and hard-reject behavior.

Validation

• bun run generate:schema from packages/core
• bun test scripts/migrate-hard-deprecations.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/targets-validator.test.ts packages/core/test/evaluation/preprocessors-yaml.test.ts packages/core/test/evaluation/providers/targets.test.ts packages/core/test/evaluation/providers/fallback-targets.test.ts packages/core/test/evaluation/providers/cli-schema.test.ts packages/core/test/evaluation/providers/targets-cwd-fallback.test.ts packages/core/test/evaluation/source-traceability.test.ts packages/core/test/evaluation/loaders/config-loader.test.ts
• bun run validate:examples (108 valid, 0 invalid)
• bun run build
• git diff --check

Notes

• GitHub Actions ${{ ... }} syntax remains intentionally untouched.
• Versioned v4.42 docs and migration/historical references are left as historical/deferred cleanup; av-kfik.34.4 remains open for broader SDK/docs/public-surface cleanup.

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