Code v5: author-only acceptance

Issue 05. HeadlessLoop and ScaleUp acceptance author via beam with no enumerator rescue: headless shadow 2/4 (cost 487 vs 14673), scale evolved-policy 0/4 both families. Every verdict carries path and author verdict; reject histogram in summaries; enumerator column behind a debug flag only. Tests rewritten to honest rates plus no-silent-rescue and debug-column proofs. README split into author headlines, debug enumerator column, legacy mixed-path figures. Full suite OK, zero failures. BSD-3-Clause.