A CXU is an atomic knowledge unit containing a claim, supporting quotes, and metadata, and it uses a content-addressable ID formed from 1220 plus SHA-256 so that each unit is independently identifiable.

**CXU (Context Unit):** Atomic knowledge unit with claim, supporting quotes, and metadata; content-addressable ID (1220 + SHA-256)

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

Atomic knowledge unit

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

claim, supporting quotes, and metadata

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

content-addressable ID (1220 + SHA-256)

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md