docs(evals): audit Promptfoo schema parity

[christso]

Summary

• adds a Promptfoo schema parity audit for AgentV eval authoring at docs/plans/promptfoo-schema-parity-audit.md
• records concrete keep/modify/remove recommendations for AgentV-only eval fields
• creates and links follow-up Beads for actionable schema/docs work

Follow-up Beads

• av-ibec: hard-deprecate top-level eval YAML experiment
• av-sdit: align provider declarations with Promptfoo provider schema
• av-9j60: enforce snake_case eval wire keys with Promptfoo camelCase boundary mapping
• av-sve2: move eval-level defaults/top-level assert toward compatible slots
• av-n7ic: align or reclassify extensions
• av-8h4l: prune Promptfoo-incompatible run-policy fields
• av-eniz: converge eval metadata/tags
• av-ij5o: clarify AgentV-only authored assertion types

Validation

• git diff --cached --check
• research-only task: no builds/tests/evals run

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