A digital garden depends on connections between pieces of knowledge.
If a project points to a note that no longer exists, the failure is not merely cosmetic. The archive has lost part of its structure.
That makes content relationships an architectural concern.
The Lab now treats relationship targets as build-time data integrity requirements. A misspelled, missing or self-referential collection:entry-id reference should stop verification rather than silently disappear.
The principle is simple:
connected knowledge should fail loudly when its connections become invalid.