feat(wire): 地基④ wire.go 接 vision/voice/mcp/skill/exec 五个子系统，从死代码变可用

- vision：model.Router 绑 WithVisionModel(LLM_VISION_MODEL)；vision.RegisterTools(VisualTool/OCRTool)
  用同一 OpenAICompatibleAdapter（LLM_BASE_URL 为空则跳过并 Warn）。
- voice：voice.New(cfg.Voice) Chain（cloud→local→edge-tts/espeak→silent）存 a.voice。
- mcp：读 cfg.MCP.ServersJSON → 逐 Enabled server mcp.NewRegistry(...).Register(ctx)（Connect+
  DiscoverTools+RegisterTool），注册 KindMCP 能力 mcp:<name> 供 adminListPlugins 枚举；
  close() 中 Unregister 防 stdio 子进程孤儿；每 server 15s connect 超时，失败 Warn 跳过。
- skills：LoadDir(configs/skills) → skills.Register 为 KindSkill（Runner.Run 仍 ErrRunPending，
  执行留后续）。
- exec/terminal：新 terminalTool(sdk.Tool) 内部调 execProv.Execute，注册进 dispatcher；
  ExecSandbox.Enabled=false 默认拦截（授权默认关）。
- config：LLMConfig 增 VisionModel(LLM_VISION_MODEL)；新增 MCPConfig/ServersJSON(MCPSERVERS_JSON)。
- 拆 5 个辅助文件（vision.go/voice.go/mcp.go/skills.go/terminal_tool.go）避免 wire.go 膨胀；
  wire.go 最终 535 行。

默认配置下各子系统干净跳过不阻断启动（LLM_BASE_URL 已配则 vision 用主模型降级）。
go build/vet/test 全绿（46 包），gofmt 干净。

cmd/cyrene/skills.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"git.yeij.top/AskaEth/Cyrene_v2/internal/capability/skills"
+	"git.yeij.top/AskaEth/Cyrene_v2/internal/logger"
+)
+
+// defaultSkillsDir is the on-disk directory of skill YAML definitions. It is
+// optional: a missing directory skips skill loading with a warning.
+const defaultSkillsDir = "configs/skills"
+
+// wireSkills loads skill definitions from configs/skills and registers each into
+// the capability registry as a KindSkill capability so the plugin ecosystem can
+// enumerate them. Load+register is the M5 deliverable; Runner.Run (executing a
+// skill end to end) lands in a later milestone and currently returns ErrRunPending.
+func (a *app) wireSkills() {
+	log := logger.WithSource(a.log, "cmd/cyrene")
+	list, err := skills.NewLoader(a.log).LoadDir(defaultSkillsDir)
+	if err != nil {
+		log.Warn("skills load skipped", "dir", defaultSkillsDir, "error", err)
+		return
+	}
+	if len(list) == 0 {
+		log.Debug("no skills defined", "dir", defaultSkillsDir)
+		return
+	}
+	registered := 0
+	for _, s := range list {
+		if err := skills.Register(a.caps, s); err != nil {
+			log.Warn("skill register skipped", "skill", s.Name(), "error", err)
+			continue
+		}
+		registered++
+	}
+	log.Info("skills registered", "registered", registered, "loaded", len(list))
+}