Remove/downgrade various TODO(euclid migration) comments.

Most of these are more like further design issues than incomplete
migration.

all-is-cubes-base/src/math/color.rs

@@ -80,7 +80,7 @@ pub struct Rgba {
 
 /// Unit-of-measure type for vectors that contain color channels.
 //---
-// TODO(euclid migration): Better name?
+// TODO: replace this with formally accurate units.
 #[expect(clippy::exhaustive_enums)]
 #[derive(Debug, Eq, PartialEq)]
 pub enum Intensity {}

all-is-cubes-base/src/raycast/ray.rs

@@ -22,7 +22,6 @@ use crate::math::GridAab;
 #[expect(clippy::exhaustive_structs)]
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub struct Ray {
-    // TODO(euclid migration): should we expose the coordinate unit generic?
     /// The sole endpoint of the ray.
     pub origin: FreePoint,
 

all-is-cubes-mesh/src/block_mesh/planar.rs

@@ -300,8 +300,7 @@ pub(super) struct QuadTransform {
     // TODO: specialize transforms since there are only 6 possible values plus scale,
     // so we don't need as many ops as a full matrix-vector multiplication?
     // Or would the branching needed make it pointless?
-    //
-    // TODO(euclid migration): We can at least make this a RigidTransform3D
+    // We can at least make this a euclid::RigidTransform3D.
     position_transform: Transform3D<FreeCoordinate, Cube, Cube>,
     texture_transform: Transform3D<TextureCoordinate, TexelUnit, TexelUnit>,
 }

all-is-cubes-mesh/src/texture.rs

@@ -17,7 +17,6 @@ use all_is_cubes::util::{ConciseDebug, Fmt};
 pub(crate) type TextureCoordinate = f32;
 
 /// Unit-of-measure identifier used with [`euclid`](all_is_cubes::euclid) for “whole texels”.
-/// TODO(euclid migration): Better name, and a type alias for the point
 #[expect(clippy::exhaustive_enums)]
 #[derive(Debug)]
 pub enum TexelUnit {}

all-is-cubes-port/src/gltf/texture.rs

@@ -174,7 +174,7 @@ impl texture::Plane for GltfTexturePlane {
             .rotation
             .to_rotation_matrix()
             .to_free()
-            .with_source::<texture::TexelUnit>() // TODO(euclid migration): clunky
+            .with_source::<texture::TexelUnit>() // TODO: avoid these unit changes by being able to get Transform3D straight from GridRotation
             .with_destination::<texture::TexelUnit>()
             .transform_point3d(tc_in_tile.map(f64::from))
             .unwrap()

all-is-cubes/src/character.rs

@@ -300,7 +300,6 @@ impl Character {
         self.body.flying = flying;
 
         let dt = tick.delta_t().as_secs_f64();
-        // TODO(euclid migration): take advantage of coordinate system types
         let control_orientation = Rotation3D::around_y(-Angle::radians(self.body.yaw.to_radians()));
         // TODO: apply pitch too, but only if wanted for flying (once we have not-flying)
         let initial_body_velocity = self.body.velocity;