Prompt-eval & VLM

VERIFIED Multimodal PromptSet evaluation produces Detection / TriageCase artifacts.

• Dual prompt registries exist (keep them consistent when changing prompts)
• Confidence gate 0.5
• VLM call timeout 60s
• Guardrails aligned with Promptdesk standard (no API keys in prompts; fail closed)

NOT FOUND Offline eval harness as a shipping product feature.