feat(capability): 转码能力装配进组合根（工具真进注册表、日志带 source）+ design/25 非bit-exact 留痕更正

cmd/cyrene/wire.go

@@ -11,6 +11,7 @@ import (
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/capability/mcp"
 	pluginmgr "git.yeij.top/AskaEth/Cyrene_v2/internal/capability/plugin"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/capability/registry"
+	"git.yeij.top/AskaEth/Cyrene_v2/internal/capability/transcode"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/session"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/config"
 	"git.yeij.top/AskaEth/Cyrene_v2/internal/db"
@@ -62,9 +63,13 @@ type app struct {
 	llm          *model.RuntimeLLM
 	personas     *personareg.Registry
 	caps         *registry.Registry
-	dispatcher   *tool.Dispatcher
-	memStore     *memory.Store
-	retriever    *memory.Retriever
+	// transcoder 是本地转码引擎（design/25）：进程内、同步、纯本地，供渠道与其它
+	// 模块经依赖注入调用；同一个引擎也以 `transcode` 工具注册进 caps。装配只告警、
+	// 绝不阻塞启动，见 wire_transcode.go。
+	transcoder transcode.Transcoder
+	dispatcher *tool.Dispatcher
+	memStore   *memory.Store
+	retriever  *memory.Retriever
 	// embedder 与 memoryTidy 属于记忆整理（design/23）：整理只在 embedder
 	// 上算召回相似度，绝不接触会话/历史读数。
 	embedder      embedding.Embedder