Format the tree the way the gate asks for it

`cargo fmt --check` is a required step and had drifted across 45 files. Most of
it arrived this week: several operations were written in parallel worktrees and
merged by hand, and a hand-merge resolves conflicts without ever running the
formatter over the result.

No behaviour changes — this is `cargo fmt --all` and nothing else, kept as its
own commit so the next reader can skip it wholesale rather than search it for
one that matters.

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

core/dr-pipeline/src/lib.rs

@@ -44,8 +44,8 @@ pub mod preset;
 pub mod sidecar;
 
 pub use descriptor::{
-    Attribute, Facet, LocalizedKey, OpDescriptor, OpId, ParamDescriptor, ParamId, ParamKind, Presentation,
-    Scale, Unit, WidgetDemand, WidgetKind,
+    Attribute, Facet, LocalizedKey, OpDescriptor, OpId, ParamDescriptor, ParamId, ParamKind,
+    Presentation, Scale, Unit, WidgetDemand, WidgetKind,
 };
 pub use detail::{
     compose_detail, ComposedDetail, ComposedDetailPass, DetailPass, DetailStage, RenderScale,