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/tests/attributes.rs

@@ -40,7 +40,10 @@ fn the_groups_are_derivable_from_the_chain() {
     present.sort();
     present.dedup();
 
-    assert!(present.contains(&Attribute::Tone), "the chain has tonal work");
+    assert!(
+        present.contains(&Attribute::Tone),
+        "the chain has tonal work"
+    );
     assert!(present.contains(&Attribute::Colour));
     assert!(
         present.contains(&Attribute::Geometry),

core/dr-pipeline/tests/mask_sidecar.rs

@@ -55,7 +55,14 @@ fn a_region_mask_survives_a_round_trip() {
     assert_eq!(layer.id, "m1");
     assert_eq!(layer.name, "Subject");
     assert_eq!(layer.source, regions(&[3, 7, 12]));
-    assert_eq!(layer.ops.iter().find(|o| o.descriptor().id.0 == "exposure").map(|o| o.param(ParamId("exposure"))), Some(0.75));
+    assert_eq!(
+        layer
+            .ops
+            .iter()
+            .find(|o| o.descriptor().id.0 == "exposure")
+            .map(|o| o.param(ParamId("exposure"))),
+        Some(0.75)
+    );
 }
 
 #[test]
@@ -120,7 +127,10 @@ fn flags_and_opacity_survive() {
     let layer = &restored.masks().layers()[0];
     assert!(layer.invert);
     assert!((layer.opacity - 0.35).abs() < 1e-6);
-    assert!(!layer.enabled, "a disabled layer must stay disabled, not vanish");
+    assert!(
+        !layer.enabled,
+        "a disabled layer must stay disabled, not vanish"
+    );
 }
 
 /// A selection's identity is the *set*. Two files naming the same regions in
@@ -272,7 +282,10 @@ fn unknown_top_level_keys_still_round_trip_alongside_masks() {
         exposure.exposure = 1\n";
 
     let out = Sidecar::parse(text).expect("parse").to_text();
-    assert!(out.contains("future.thing"), "unknown keys are still preserved");
+    assert!(
+        out.contains("future.thing"),
+        "unknown keys are still preserved"
+    );
     assert!(out.contains("[mask default m1]"));
 }
 
@@ -361,7 +374,13 @@ fn a_brush_layer_writes_one_line_per_stroke() {
         .lines()
         .filter(|l| l.starts_with("stroke = "))
         .collect();
-    assert_eq!(lines, ["stroke = add 0.05 0.5 1 0.2,0.5 0.8,0.5", "stroke = erase 0.05 0.5 1 0.5,0.5"]);
+    assert_eq!(
+        lines,
+        [
+            "stroke = add 0.05 0.5 1 0.2,0.5 0.8,0.5",
+            "stroke = erase 0.05 0.5 1 0.5,0.5"
+        ]
+    );
 }
 
 #[test]

core/dr-pipeline/tests/tone_curve.rs

@@ -12,7 +12,8 @@ use dr_pipeline::{EditGraph, Sidecar};
 
 /// A version block carrying `params`, in the on-disk spelling.
 fn sidecar_with(params: &[(&str, f32)]) -> String {
-    let mut text = String::from("drsc 1\n\n[version u1]\nname = Default\nrevision = 2\nmodified = 0\n");
+    let mut text =
+        String::from("drsc 1\n\n[version u1]\nname = Default\nrevision = 2\nmodified = 0\n");
     for (key, value) in params {
         text.push_str(&format!("{key} = {value}\n"));
     }
@@ -199,4 +200,3 @@ fn every_point_of_every_curve_round_trips_through_a_sidecar() {
         }
     }
 }
-