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-decode/src/profile.rs

@@ -1048,7 +1048,11 @@ mod tests {
         // would render black, which is much harder to diagnose than
         // uncalibrated.
         assert!(!usable(&[[0.0; 3]; 3]));
-        assert!(!usable(&[[f32::NAN, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]]));
+        assert!(!usable(&[
+            [f32::NAN, 0.0, 0.0],
+            [0.0, 1.0, 0.0],
+            [0.0, 0.0, 1.0]
+        ]));
         assert!(usable(&SIX_D_D65));
     }