Feature graph: each feature of a timeline in plain words

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo

crates/ui-egui/src/lib.rs

@@ -30,6 +30,7 @@ pub mod context;
 pub mod control;
 pub mod describe;
 pub mod elide;
+pub mod feature_graph;
 pub mod fields;
 pub mod files;
 pub mod form;