Build dependency graph and dependency aware propagation of changes

docs/terminology.md

@@ -93,6 +93,18 @@ normalization.
   than disappearing.
 - Classification: a main type plus optional additional attributes that help
   users filter and orient without forcing every item into a single rigid box.
+- Dependency: a directed edge showing that one fact or characteristic affects
+  another. Edges record type, strength, source, ownership, and whether the edge
+  stays within the same layer.
+- Staleness: a freshness state assigned when an upstream dependency changes and
+  a downstream characteristic may no longer be current.
+- Recalculation: an automated refresh of deterministic or mixed derived content
+  after upstream changes. Curator-owned claims should be reviewed before the new
+  value becomes approved registry truth.
+- Propagation rate: the breadth and depth of downstream impact from changed
+  inputs. High propagation can indicate rapid discovery, weak normalization, or
+  brittle conceptual boundaries; it is a signal for review, not a score by
+  itself.
 
 ## Extraction Philosophy