Map MetaSkills eval templates to AgentV YAML specs

[smota]

Parent epic: #18

Goal

Document mapping from existing MetaSkills eval templates to AgentV YAML specs.

Existing source templates

• skills/agent-builder/templates/agent-evals.md
• skills/skill-creator/templates/skill-eval-spec.md

Mapping to define

MetaSkills fields:

• Scenario
• Prompt
• Expected behavior
• Must include
• Must not include
• Pass criteria
• Category
• Known gap / regression flags

AgentV concepts:

• eval description
• target/provider
• tests
• input
• criteria
• script graders
• llm-rubric graders
• result metadata/tags

Acceptance criteria

• Add toolsets/agentv/mappings/metaskills-eval-to-agentv.md.
• Include at least one full before/after conversion example.
• Include guidance for deterministic checks vs LLM rubric checks.
• Include category mapping for scope, knowledge, tool-action, safety, UX, orchestration, environment.