Compression Diagnostics: Measuring What the AI Burns, Invents, and Distorts

EA-CD-01 — Measurement science definition for Compression Diagnostics: the quantitative measurement of what survives AI compression. Defines five metrics: β (Beige Threshold), Δ_G⁺ (Content Gain/Hallucination), Δ_G⁻ (Content Loss/Erasure), S_c (Semantic Coherence/Fragmentation), R (Compression Regime). Calibration data from Basecamp audit. Instrument: The Encyclotron. Related disciplines: Retrieval Architecture, Retrieval Forensics, Entity Integrity, Metadata Packet for AI Indexing. Published in Transactions of the Semantic Economy Institute, Vol. 2, No. 4.