Four tests for binary informational substitutes

Unrefereed candidate, version 1.1.0. Four necessary-and-sufficient weighted-square tests classify binary informational substitutes under the quadratic score and Chen–Waggoner March 2017 Definition 2.2.3. Includes zero-support cases, rational failure disclosures, an oriented finite-signal extension, strong-complements tests, and a reviewer-derived strict comparison with projective substitutes. Universal written proof and internal exact finite replay are distinct; no external peer review, independent reproduction, formal verification or historical priority is claimed.