Add new build tag for WhatsApp native support to keep the binary smaller.

pkg/channels/whatsapp_native.go

@@ -1,3 +1,5 @@
+//go:build whatsapp_native
+
 // PicoClaw - Ultra-lightweight personal AI agent
 // License: MIT
 //
@@ -58,16 +60,17 @@ type WhatsAppNativeChannel struct {
 
 // NewWhatsAppNativeChannel creates a WhatsApp channel that uses whatsmeow for connection.
 // storePath is the directory for the SQLite session store (e.g. workspace/whatsapp).
-func NewWhatsAppNativeChannel(cfg config.WhatsAppConfig, bus *bus.MessageBus, storePath string) (*WhatsAppNativeChannel, error) {
+func NewWhatsAppNativeChannel(cfg config.WhatsAppConfig, bus *bus.MessageBus, storePath string) (Channel, error) {
 	base := NewBaseChannel("whatsapp", cfg, bus, cfg.AllowFrom)
 	if storePath == "" {
 		storePath = "whatsapp"
 	}
-	return &WhatsAppNativeChannel{
+	c := &WhatsAppNativeChannel{
 		BaseChannel: base,
 		config:      cfg,
 		storePath:   storePath,
-	}, nil
+	}
+	return c, nil
 }
 
 func (c *WhatsAppNativeChannel) Start(ctx context.Context) error {

pkg/channels/whatsapp_native_stub.go

@@ -0,0 +1,16 @@
+//go:build !whatsapp_native
+
+package channels
+
+import (
+	"fmt"
+
+	"github.com/sipeed/picoclaw/pkg/bus"
+	"github.com/sipeed/picoclaw/pkg/config"
+)
+
+// NewWhatsAppNativeChannel returns an error when the binary was not built with -tags whatsapp_native.
+// Build with: go build -tags whatsapp_native ./cmd/...
+func NewWhatsAppNativeChannel(cfg config.WhatsAppConfig, bus *bus.MessageBus, storePath string) (Channel, error) {
+	return nil, fmt.Errorf("whatsapp native not compiled in; build with -tags whatsapp_native")
+}