docs: 修正全部文档使其与源码实现一致

- Plugin.Start(sdk *PluginSDK) 接口签名改为指针
- 方法表重写: 移除 CallLLM/QueryKnowledge/SetMemory 等不存在方法
- IOInjector 参数顺序修正为 (source, channel, text)
- 删除虚构 SDKConfig, 替换为实际 New() 构造函数签名
- .hmap 内容描述一致化 (plugin.so + plugin.dll + main.lua)
- 添加 meta/ 包元数据文件

tools/plugindev/main.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		help()
+		return
+	}
+	switch os.Args[1] {
+	case "init":
+		cmdInit(os.Args[2:])
+	case "build":
+		cmdBuild(os.Args[2:])
+	case "clean":
+		cmdClean(os.Args[2:])
+	case "debug":
+		cmdDebug(os.Args[2:])
+	default:
+		help()
+	}
+}
+
+func help() {
+	fmt.Println(`HomeAgent Plugin Dev Tool
+
+Usage:
+  plugindev init <name>           Scaffold a new plugin project
+  plugindev build [flags]         Compile and package plugin
+  plugindev clean                 Clean build/dist artifacts
+  plugindev debug [dir]           Interpret and debug plugin source
+
+Flags:
+  --outdir    Output directory (default: dist)
+  --target    Target OS/arch (e.g. linux/amd64), repeatable
+  --lua       Create Lua plugin (for init)
+`)
+}