fix(whatsapp_native): thread VoiceConfig to fix EchoTranscription compile error

WhatsAppNativeChannel was referencing c.config.EchoTranscription but
EchoTranscription belongs to VoiceConfig, not WhatsAppConfig. Add
voiceConfig field to the struct and pass cfg.Voice through the
constructor so the field resolves correctly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pkg/channels/whatsapp_native/init.go

@@ -15,6 +15,6 @@ func init() {
 		if storePath == "" {
 			storePath = filepath.Join(cfg.WorkspacePath(), "whatsapp")
 		}
-		return NewWhatsAppNativeChannel(waCfg, b, storePath)
+		return NewWhatsAppNativeChannel(waCfg, cfg.Voice, b, storePath)
 	})
 }

pkg/channels/whatsapp_native/whatsapp_native.go

@@ -51,6 +51,7 @@ const (
 type WhatsAppNativeChannel struct {
 	*channels.BaseChannel
 	config       config.WhatsAppConfig
+	voiceConfig  config.VoiceConfig
 	storePath    string
 	client       *whatsmeow.Client
 	container    *sqlstore.Container
@@ -67,6 +68,7 @@ type WhatsAppNativeChannel struct {
 // storePath is the directory for the SQLite session store (e.g. workspace/whatsapp).
 func NewWhatsAppNativeChannel(
 	cfg config.WhatsAppConfig,
+	voiceCfg config.VoiceConfig,
 	bus *bus.MessageBus,
 	storePath string,
 ) (channels.Channel, error) {
@@ -80,6 +82,7 @@ func NewWhatsAppNativeChannel(
 	c := &WhatsAppNativeChannel{
 		BaseChannel: base,
 		config:      cfg,
+		voiceConfig: voiceCfg,
 		storePath:   storePath,
 	}
 	return c, nil
@@ -428,7 +431,7 @@ func (c *WhatsAppNativeChannel) handleIncoming(evt *events.Message) {
 		metadata["peer_kind"] = "direct"
 		metadata["peer_id"] = senderID
 	}
-	if len(mediaPaths) > 0 && c.config.EchoTranscription {
+	if len(mediaPaths) > 0 && c.voiceConfig.EchoTranscription {
 		metadata["echo_transcription"] = "true"
 	}
 

pkg/channels/whatsapp_native/whatsapp_native_stub.go

@@ -14,6 +14,7 @@ import (
 // Build with: go build -tags whatsapp_native ./cmd/...
 func NewWhatsAppNativeChannel(
 	cfg config.WhatsAppConfig,
+	voiceCfg config.VoiceConfig,
 	bus *bus.MessageBus,
 	storePath string,
 ) (channels.Channel, error) {