feat: auto-infer typed enum params from int32 in idiomgen

C headers declare enum params as bare `int`, so the spec records
`int32`. This made examples require ugly casts like
`mgr.DefaultSensor(int32(sensor.Accelerometer))`.

Fix: after collecting value enums, build a set of their Go names.
When a function param has type int32 and PascalCase(paramName) matches
a value enum GoName, use the typed enum instead. Also supports
explicit overlay override via `param_types` field on FuncOverlay.

Affects 9 params across 7 modules (sensor, asset, config, bitmap,
logging, nativewindow, neuralnetworks). Also fixes capiArg to not
prefix scalar Go types with `capi.` (e.g. int32 → int32(), not
capi.int32()).

Examples updated to remove int32() casts.

Author: xaionaro@dx.center

asset/manager.go

@@ -108,7 +108,7 @@ func main() {
 
 	if mgr != nil {
 		// Open a text file from the APK's assets/ directory.
-		a := mgr.Open("data/config.json", int32(asset.Streaming))
+		a := mgr.Open("data/config.json", asset.Streaming)
 		defer a.Close()
 
 		// Query total size. Length returns off_t (32-bit on older ABIs),
@@ -141,7 +141,7 @@ func main() {
 		// With Buffer mode, the entire asset is accessible through a
 		// direct pointer without calling Read:
 		//
-		//   a := mgr.Open("data/config.json", int32(asset.Buffer))
+		//   a := mgr.Open("data/config.json", asset.Buffer)
 		//   ptr := a.Buffer()  // unsafe.Pointer to the raw data
 		//   data := unsafe.Slice((*byte)(ptr), a.Length64())
 	}

config/config.go

@@ -36,7 +36,7 @@ func main() {
 	// device lacks the requested sensor type, the underlying C pointer
 	// is NULL and any method call will crash. We call Name() first and
 	// treat an empty result (or panic) as "sensor not available."
-	accel := mgr.DefaultSensor(int32(sensor.Accelerometer))
+	accel := mgr.DefaultSensor(sensor.Accelerometer)
 
 	name := accel.Name()
 	if name == "" {

examples/asset/overview/main.go

@@ -50,7 +50,7 @@ func main() {
 	log.Println("sensor manager obtained")
 
 	// --- 2. Query default accelerometer ---
-	accel := mgr.DefaultSensor(int32(sensor.Accelerometer))
+	accel := mgr.DefaultSensor(sensor.Accelerometer)
 	name := accel.Name()
 	if name == "" {
 		log.Fatal("no default accelerometer on this device")

examples/sensor/accelerometer/main.go

@@ -124,15 +124,15 @@ func main() {
 	// switching pixel formats.
 	//
 	//   // Set 720p resolution with RGBA8888 format.
-	//   if err := win.SetBuffersGeometry(1280, 720, int32(window.Rgba8888)); err != nil {
+	//   if err := win.SetBuffersGeometry(1280, 720, window.Rgba8888); err != nil {
 	//       log.Fatalf("set geometry: %v", err)
 	//   }
 	//
 	//   // Or keep current dimensions and only change the format:
-	//   win.SetBuffersGeometry(0, 0, int32(window.Rgb565))
+	//   win.SetBuffersGeometry(0, 0, window.Rgb565)
 
 	fmt.Println("Step 3: Configure buffer geometry")
-	fmt.Println("  win.SetBuffersGeometry(1280, 720, int32(window.Rgba8888))")
+	fmt.Println("  win.SetBuffersGeometry(1280, 720, window.Rgba8888)")
 	fmt.Println("  // Pass 0 for width/height to keep current dimensions.")
 	fmt.Println()
 

examples/sensor/event-loop/main.go

@@ -54,6 +54,11 @@ func capiArg(p MergedParam) string {
 			}
 			return "(" + strings.Repeat("*", stars) + "capi." + base + ")(" + p.Name + ")"
 		}
+		// Scalar Go types (int32, uint32, etc.) don't need a capi. prefix —
+		// they're built-in types, not capi package types.
+		if isScalarGoType(p.CapiType) {
+			return p.CapiType + "(" + p.Name + ")"
+		}
 		return "capi." + p.CapiType + "(" + p.Name + ")"
 	}
 	return p.Name
@@ -256,6 +261,9 @@ func FuncMap() template.FuncMap {
 				if strings.HasPrefix(p.CapiType, "*") {
 					return "(*capi." + p.CapiType[1:] + ")(" + p.Name + ")"
 				}
+				if isScalarGoType(p.CapiType) {
+					return p.CapiType + "(" + p.Name + ")"
+				}
 				return "capi." + p.CapiType + "(" + p.Name + ")"
 			}
 			return p.Name
@@ -287,6 +295,9 @@ func FuncMap() template.FuncMap {
 				if strings.HasPrefix(p.CapiType, "*") {
 					return "(*capi." + p.CapiType[1:] + ")(" + p.Name + ")"
 				}
+				if isScalarGoType(p.CapiType) {
+					return p.CapiType + "(" + p.Name + ")"
+				}
 				return "capi." + p.CapiType + "(" + p.Name + ")"
 			}
 			return p.Name