Closing the Verification Loop in Generative Development: An External Transactional State Machine and a Field Evaluation of Its Economics and Convergence

Preprint. A field study of an external transactional state machine that verifies LLM-generated software: readiness becomes a signed, re-verifiable fact instead of the executor's opinion. Three executor hands and independent judges on a 25-task battery (5 task senses x 5 stacks); measured the full path economics in tokens, seconds, and human attention. Source and campaign materials: https://github.com/neurophant/punchtape