feat(core): support promptfoo provider declaration forms

[christso]

Summary

AgentV provider declarations now accept the Promptfoo-compatible forms that were missing from the parser: provider spec strings, provider maps, and providers[].inputs. Object-form id remains the backend/spec and label remains the stable AgentV selection and result identity.

The Promptfoo export helper now preserves compatible provider maps and inputs, and it rejects AgentV-only provider-local environment, provider hooks, and non-host runtime settings with explicit diagnostics instead of silently dropping testbed behavior. runtime: host continues to lower as a no-op because Promptfoo runs host providers by default.

Docs and the eval-writer schema now describe the supported provider declaration layer and call out runtime, provider-local environment, and provider hooks as AgentV extensions.

Validation

• bun test packages/core/test/evaluation/validation/eval-file-schema.test.ts packages/core/test/evaluation/loaders/config-loader.test.ts packages/core/test/evaluation/providers/targets-file.test.ts
• bun run validate:promptfoo-export
• bun run validate:eval-schema
• bun --filter @agentv/core typecheck
• git diff --check

Live provider dogfood was not run because this changes parsing, schema, docs, and Promptfoo export diagnostics only; provider invocation/runtime behavior is unchanged.

Risk

Low. The new parser path is additive for Promptfoo-compatible provider shapes, and existing provider object/string declarations remain covered by focused tests.

Related: Bead av-sdit

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