Align slimming with 76 indexed landmarks and 17 sequential local pins; pass 604 offline checks

scripts/test.sh

@@ -9,3 +9,5 @@ xcrun clang "${common[@]}" "$plugin_dir/PGBeautyRenderer.m" tests/beauty_render_
 "$output_dir/beauty-tests"
 xcrun clang "${common[@]}" "$plugin_dir/PGFaceProcessor.m" tests/face_tests.m -o "$output_dir/face-tests"
 "$output_dir/face-tests" "$PWD/tests/fixtures/astronaut.png"
+xcrun clang "${common[@]}" "$plugin_dir/PGFaceProcessor.m" tests/slim_tests.m -o "$output_dir/slim-tests"
+"$output_dir/slim-tests" "$PWD/tests/fixtures/astronaut.png"