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Zinc runs shaped work through packages and records the lineage.

It sits between Circuitry, packages, and Limbo:

Layer	Responsibility
Circuitry	Confirms shaped YAML and variable flow.
Zinc	Resolves package surfaces, builds context, and records lineage.
Packages	Provide surface, settings, shapes, scripts, docs, and output meaning.
Limbo	Stores rows and bytes.

Main pages

Page	Use it for
Architecture	How the layers fit together.
Packages	Package identity, sources, requirements, and manifests.
Package Surfaces	How Zinc runs package surfaces.
Shapes	How Zinc uses Circuitry shape facts.
Executor	The run loop that advances work.
URI Reference	zinc:// paths for reading store and package facts.
Update	Checking for and applying Zinc updates.

Boundary

Zinc remembers:

• package name, version, root, source facts, and soft requirements
• selected context sent to package surfaces
• package output bytes
• immutable lineage nodes
• opaque config values

Zinc does not interpret package settings, model responses, shell behavior, provider behavior, or package response schemas.