Jev:    100,000 × 1 call × ~600 tokens (state + 5 questions) = 60M × $0.042/M = ~$2.50
Tail:   assume 5% escalated → 5,000 LLM calls
        input  5,000 × 700 tokens = 3.5M × $3/M  = $10.50
        output 5,000 × 300 tokens = 1.5M × $15/M = $22.50
                                                             Total ≈ $36 / month