Emit floats an f32 can hold, and drop the format! that formats nothing

CI runs cargo fmt --check and clippy -D warnings, and this branch had
never been through either. Both would have failed it.

The bulk was the generated colour tables: eight significant figures where
an f32 carries about 7.2, so the eighth is noise that rounds away at
compile time and clippy's excessive_precision says so 109 times over.
Fixed in the generator rather than only in the file, so it stays fixed --
and the file is trimmed in place rather than re-derived, because
regenerating it needs a colour-science stack that has nothing to do with
the defect.

The format! in the composer is mine too, from extracting the rendering
tail: the braces in it were escaped because the text used to live inside a
larger template, and once extracted the escapes are noise and the call
formats nothing.

Also here, and clearly not mine: an unused import and a shadowed binding
in dr-gpu, and an unused import in a test. They are pre-existing --
clippy has been failing on master before this branch existed, on lints
like is_multiple_of that arrived with a toolchain rather than with
anyone's code. Fixed because CI cannot go green around them, and called
out because a merge commit is a bad place to quietly edit someone else's
crate.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

core/dr-film/src/built_in.rs

@@ -6,35 +6,116 @@
 
 /// Each stock's id and its YAML, in the order the converter ran.
 pub static BUILT_IN: &[(&str, &str)] = &[
-    ("fujifilm_c200", include_str!("../profiles/fujifilm_c200.yaml")),
-    ("fujifilm_crystal_archive_typeii", include_str!("../profiles/fujifilm_crystal_archive_typeii.yaml")),
-    ("fujifilm_pro_400h", include_str!("../profiles/fujifilm_pro_400h.yaml")),
-    ("fujifilm_provia_100f", include_str!("../profiles/fujifilm_provia_100f.yaml")),
-    ("fujifilm_velvia_100", include_str!("../profiles/fujifilm_velvia_100.yaml")),
-    ("fujifilm_xtra_400", include_str!("../profiles/fujifilm_xtra_400.yaml")),
+    (
+        "fujifilm_c200",
+        include_str!("../profiles/fujifilm_c200.yaml"),
+    ),
+    (
+        "fujifilm_crystal_archive_typeii",
+        include_str!("../profiles/fujifilm_crystal_archive_typeii.yaml"),
+    ),
+    (
+        "fujifilm_pro_400h",
+        include_str!("../profiles/fujifilm_pro_400h.yaml"),
+    ),
+    (
+        "fujifilm_provia_100f",
+        include_str!("../profiles/fujifilm_provia_100f.yaml"),
+    ),
+    (
+        "fujifilm_velvia_100",
+        include_str!("../profiles/fujifilm_velvia_100.yaml"),
+    ),
+    (
+        "fujifilm_xtra_400",
+        include_str!("../profiles/fujifilm_xtra_400.yaml"),
+    ),
     ("kodak_2383", include_str!("../profiles/kodak_2383.yaml")),
     ("kodak_2393", include_str!("../profiles/kodak_2393.yaml")),
-    ("kodak_ektachrome_100", include_str!("../profiles/kodak_ektachrome_100.yaml")),
-    ("kodak_ektacolor_edge", include_str!("../profiles/kodak_ektacolor_edge.yaml")),
-    ("kodak_ektar_100", include_str!("../profiles/kodak_ektar_100.yaml")),
-    ("kodak_endura_premier", include_str!("../profiles/kodak_endura_premier.yaml")),
-    ("kodak_gold_200", include_str!("../profiles/kodak_gold_200.yaml")),
-    ("kodak_kodachrome_64", include_str!("../profiles/kodak_kodachrome_64.yaml")),
-    ("kodak_portra_160", include_str!("../profiles/kodak_portra_160.yaml")),
-    ("kodak_portra_400", include_str!("../profiles/kodak_portra_400.yaml")),
-    ("kodak_portra_800", include_str!("../profiles/kodak_portra_800.yaml")),
-    ("kodak_portra_800_push1", include_str!("../profiles/kodak_portra_800_push1.yaml")),
-    ("kodak_portra_800_push2", include_str!("../profiles/kodak_portra_800_push2.yaml")),
-    ("kodak_portra_endura", include_str!("../profiles/kodak_portra_endura.yaml")),
-    ("kodak_supra_endura", include_str!("../profiles/kodak_supra_endura.yaml")),
-    ("kodak_ultra_endura", include_str!("../profiles/kodak_ultra_endura.yaml")),
-    ("kodak_ultramax_400", include_str!("../profiles/kodak_ultramax_400.yaml")),
-    ("kodak_verita_200d", include_str!("../profiles/kodak_verita_200d.yaml")),
-    ("kodak_vision3_50d", include_str!("../profiles/kodak_vision3_50d.yaml")),
-    ("kodak_vision3_200t", include_str!("../profiles/kodak_vision3_200t.yaml")),
-    ("kodak_vision3_250d", include_str!("../profiles/kodak_vision3_250d.yaml")),
-    ("kodak_vision3_500t", include_str!("../profiles/kodak_vision3_500t.yaml")),
+    (
+        "kodak_ektachrome_100",
+        include_str!("../profiles/kodak_ektachrome_100.yaml"),
+    ),
+    (
+        "kodak_ektacolor_edge",
+        include_str!("../profiles/kodak_ektacolor_edge.yaml"),
+    ),
+    (
+        "kodak_ektar_100",
+        include_str!("../profiles/kodak_ektar_100.yaml"),
+    ),
+    (
+        "kodak_endura_premier",
+        include_str!("../profiles/kodak_endura_premier.yaml"),
+    ),
+    (
+        "kodak_gold_200",
+        include_str!("../profiles/kodak_gold_200.yaml"),
+    ),
+    (
+        "kodak_kodachrome_64",
+        include_str!("../profiles/kodak_kodachrome_64.yaml"),
+    ),
+    (
+        "kodak_portra_160",
+        include_str!("../profiles/kodak_portra_160.yaml"),
+    ),
+    (
+        "kodak_portra_400",
+        include_str!("../profiles/kodak_portra_400.yaml"),
+    ),
+    (
+        "kodak_portra_800",
+        include_str!("../profiles/kodak_portra_800.yaml"),
+    ),
+    (
+        "kodak_portra_800_push1",
+        include_str!("../profiles/kodak_portra_800_push1.yaml"),
+    ),
+    (
+        "kodak_portra_800_push2",
+        include_str!("../profiles/kodak_portra_800_push2.yaml"),
+    ),
+    (
+        "kodak_portra_endura",
+        include_str!("../profiles/kodak_portra_endura.yaml"),
+    ),
+    (
+        "kodak_supra_endura",
+        include_str!("../profiles/kodak_supra_endura.yaml"),
+    ),
+    (
+        "kodak_ultra_endura",
+        include_str!("../profiles/kodak_ultra_endura.yaml"),
+    ),
+    (
+        "kodak_ultramax_400",
+        include_str!("../profiles/kodak_ultramax_400.yaml"),
+    ),
+    (
+        "kodak_verita_200d",
+        include_str!("../profiles/kodak_verita_200d.yaml"),
+    ),
+    (
+        "kodak_vision3_50d",
+        include_str!("../profiles/kodak_vision3_50d.yaml"),
+    ),
+    (
+        "kodak_vision3_200t",
+        include_str!("../profiles/kodak_vision3_200t.yaml"),
+    ),
+    (
+        "kodak_vision3_250d",
+        include_str!("../profiles/kodak_vision3_250d.yaml"),
+    ),
+    (
+        "kodak_vision3_500t",
+        include_str!("../profiles/kodak_vision3_500t.yaml"),
+    ),
     ("kodak_trix", include_str!("../profiles/kodak_trix.yaml")),
-    ("kodak_doublex", include_str!("../profiles/kodak_doublex.yaml")),
+    (
+        "kodak_doublex",
+        include_str!("../profiles/kodak_doublex.yaml"),
+    ),
     ("kodak_2302", include_str!("../profiles/kodak_2302.yaml")),
 ];