Merge master into wave-2

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

# Conflicts:
#	docs/traceability.md

ui/dr-ui/src/lib.rs

@@ -27,6 +27,11 @@ mod develop;
 mod display_ui;
 mod export;
 pub mod faces;
+// Generated from the `GESTURE:` comments beside the code that implements each
+// one — see `tools/traceability`. Regenerate with
+// `cargo run -p traceability -- gestures`; CI fails if it has drifted.
+mod gesture_book;
+mod gestures;
 mod gradient;
 mod histogram;
 pub mod identity;