fix: Resolve staticcheck linter warnings

Fixed three linter issues identified by staticcheck:

1. Replaced deprecated strings.Title with custom Title function
   - strings.Title was deprecated in Go 1.18
   - Used existing Title() helper function instead

2. Removed unused otherDecorators variable in WGSL generator
   - The append result was never used
   - Added comment noting other decorators aren't currently supported

3. Removed unnecessary fmt.Sprintf for static string
   - Changed fmt.Sprintf("// ...") to direct string literal
   - Improves code clarity and performance

All tests passing, linter clean.

Author: claude

pkg/codegen/gpu_go_generator.go

@@ -111,7 +111,7 @@ func (g *GPUGoGenerator) generateGPUStruct(gpuStruct *guixast.GPUStructDecl) *as
 		astType := g.parseTypeString(goType)
 
 		fields = append(fields, &ast.Field{
-			Names: []*ast.Ident{ast.NewIdent(strings.Title(field.Name))},
+			Names: []*ast.Ident{ast.NewIdent(Title(field.Name))},
 			Type:  astType,
 		})
 	}

pkg/codegen/wgsl_generator.go

@@ -170,16 +170,14 @@ func (g *WGSLGenerator) generateBinding(binding *guixast.GPUBindingDecl) {
 func (g *WGSLGenerator) generateFunction(fn *guixast.GPUFuncDecl) {
 	// Collect entry point decorators (@vertex, @fragment, @compute)
 	var entryDecorators []string
-	var otherDecorators []string
 
 	for _, decorator := range fn.Decorators {
 		// Strip @ prefix for comparison
 		name := strings.TrimPrefix(decorator.Name, "@")
 		if name == "vertex" || name == "fragment" || name == "compute" {
 			entryDecorators = append(entryDecorators, g.formatDecorator(decorator))
-		} else {
-			otherDecorators = append(otherDecorators, g.formatDecorator(decorator))
 		}
+		// Other decorators are currently not supported for functions
 	}
 
 	// Write entry point decorators
@@ -412,7 +410,7 @@ func (g *WGSLGenerator) generateFor(forLoop *guixast.ForLoop) {
 	if forLoop.Range != nil {
 		// Range-based for loop not directly supported in WGSL
 		// Convert to C-style for loop
-		g.writeln(fmt.Sprintf("// Range-based for loop not directly supported"))
+		g.writeln("// Range-based for loop not directly supported")
 		g.writeln(fmt.Sprintf("// for %s in %s", forLoop.Val, g.generateExpression(forLoop.Range)))
 	} else {
 		// C-style for loop