pChronicle concepts

pChronicle keeps the physical origin of trajectory data visible and separates write-time facts from read-time projections.

Question	Concept article
How is trajectory data addressed and fixed for one operation?	Dataset, Source, and Snapshot
Which layer owns facts, normalized views, exchange, and lineage?	Facts, projections, and revisions

These pages define the stable mental model. Query procedures belong to Guides, exact schemas and formats to Reference, and storage mechanisms to Design.