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+# Studio graph capabilities
+
+This system package implements ordinary Canvas/Placement/Placeable interfaces.
+It owns no database, web server, Worker, page session, or special presentation
+object per rendered subject. The workspace binds storage and relationship edges.
+The checked component is an independent consumer of the same public contracts.
+
+- `Canvas.create` creates an initialized canvas. The server entry factory uses the
+  workspace host's idempotent root protocol, without a second package-local cache.
+- `Canvas.place` validates the requested renderer through the subject's portable
+  `Placeable.canPresent` contract and creates one placement with both relationships.
+- `Canvas.createAndPlace` is an example compound factory: child canvas creation,
+  renderer validation and placement creation share one transaction. An invalid
+  renderer rolls back the child, too. Other domains can compose their own creation
+  ports in exactly this way; there is no frontend business reducer.
+- `position` and `size` are separate whole-record registers. Concurrent move and
+  resize survive independently; concurrent moves resolve in server acceptance
+  order without mixing one move's x coordinate with another move's y coordinate.
+- `remove` is explicitly server-only. Deletion needs the full incoming-reference
+  graph; a partial replica cannot safely predict all deletion restrictions and
+  cascades. Removing a placement preserves its subject. The interface does not
+  advertise a portable delete or keep a hidden archive in the canvas query.
+
+The generic `canPresent<atom Subject>` implementation reads the explicitly granted
+`reflection catalog [presentations]` port. This exposes only immutable checked
+presentation IDs, subject contracts and their conforming atoms. It does not expose
+live object inventory or private state. The dispatcher verifies the concrete
+receiver; reference expectations supplied by a caller are not conformance proof.
+A changed presentation catalog participates in the consuming execution group's
+reuse digest. Unrelated modules do not acquire that dependency.
+
+Queries have explicit prototype bounds: 100 canvases in navigation and 200
+placements per open canvas. Title-only cards use their own small input projection.
+A selected/new placement can retain `PlacementInputs` even if a list excludes it.
+A larger Studio should add explicit windows or pagination rather than silently
+pretend these bounded queries cover an arbitrarily large workspace.
+
+`tools/local-first/studio.nix` builds the source snapshot through the checked
+artifact builder and tests the generic workspace host. Run
+`nix build .#checks.x86_64-linux.camino-studio-capabilities` at the monorepo root.
+These are unpublished fixture resource pins; normal independently retained source
+assembly and scaffolding are qualified in WI-12. The old checkedServer/Yarn and
+migration recipes were removed, rather than presenting them as a compatible path.