`project` is a Penpot noun: a team holds projects and a project holds
files, and the graph will carry a `Project` node table. A namespace
called `app.graph.project.document` therefore reads as "the graph of a
Penpot project" and means the opposite.
`projection` is the word the rest of the subsystem already uses for the
operation: `projection-data`, `load-projection!`, `:projection` in the
ingest report, and `app.graph.schema.projection`.
Pure rename. Both namespaces and every alias move; nothing else changes.
AI-assisted-by: mixed models
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