Every CXU stored in the graph must include a content-addressable cxu_id formed as "1220" plus SHA-256(claim), producing a 68-character identifier so that each unit is deterministically keyed by its claim content.

Every CXU stored in the graph follows this structure:

— PYRANA_Internal_Knowledge_Graph_Specification.md

cxu_id: "1220" + SHA-256(claim) # Content-addressable, 68 chars

— PYRANA_Internal_Knowledge_Graph_Specification.md

CXU:

— PYRANA_Internal_Knowledge_Graph_Specification.md

claim: str # Standalone assertion, 15-70 words

— PYRANA_Internal_Knowledge_Graph_Specification.md