Add tooling hooks
Restore tests
Implement systematic deep-sideload.

See https://sprint.ly/product/15350/item/287
Add support for context.

See https://sprint.ly/product/15350/item/289
Add support for partially loaded entities.

See https://sprint.ly/product/15350/item/288
Improve missing attribute detection
Make missing attribute management more robust
Plug context even in adapter's primitives
Fix optimistic logging
Add JSON attribute codec support

Allow to exchange JSON with API, handled as string in the UI.