// Package catalogsystem owns the durable Catalog authority and fixed-purpose
// owner verifier for pre-minted system-owned layout-bundle slots.
//
// It persists exact CREATE and RETIRE commands, terminal outcomes, one current
// value per complete system BundleKey, and immutable transition history. While
// an exact candidate-source and slot read fence remain live, it also derives
// system authority evidence and a source-bound verification receipt. It does
// not prepare Catalog sources, finalize publications, backfill legacy
// declarations, or serve layouts.
package catalogsystem