feat(eval): add environment recipe schema loader (av-noh3.2.2)

[christso]

Beads remain the source of truth for this work: av-noh3.2.2.

Summary

• Add AgentV environment recipe loading for authored eval YAML at suite and case scope.
• Support inline and file:// host/docker recipes; referenced recipe-relative paths are normalized relative to the recipe file directory.
• Carry normalized recipes on EvalTest.environment for future host/Docker runtime workers.
• Reject target-level environment/testbed setup fields and hard-deprecate public workspace.repos, workspace.scope, workspace.template, and workspace.docker authoring.
• Preserve top-level env and Promptfoo-compatible extensions behavior.
• Regenerate the AI-facing eval JSON schema.

Validation

• bun install
• bun test packages/core/test/evaluation/loaders/environment-recipe.test.ts packages/core/test/evaluation/loaders/config-loader.test.ts
• bun --filter @agentv/core typecheck
• bun test packages/core/test/evaluation/validation/eval-file-schema.test.ts
• bun --filter @agentv/core lint
• bun --filter @agentv/core build
• git diff --check

No live dogfood was run because this bead is schema/loader/validation only; runtime execution is deferred to av-noh3.2.3 and av-noh3.2.4.

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