docs(plugin-arch): 归档插件架构迁移评估 + plan 第11节整改计划

- docs/zh/架构迁移评估.md: C ABI→子进程+共享内存完整迁移论证(1621行)
- docs/zh/experiments/: 18项可复跑可行性实验(架构评估的所有数字来源)
- plan.md §11: 11.1~11.9 插件架构缺陷修复清单(唯一权威编号)
- main 保持干净,本批次为 update 特性分支的整改起点

docs/zh/experiments/plugin-arch/02-feasibility/exp7.go

@@ -0,0 +1,63 @@
+//go:build ignore
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"fmt"
+	"os"
+	"os/exec"
+	"time"
+)
+
+func spawnAndAsk(bin string) string {
+	cmd := exec.Command(bin)
+	sin, _ := cmd.StdinPipe()
+	sout, _ := cmd.StdoutPipe()
+	cmd.Start()
+	enc := json.NewEncoder(sin)
+	dec := json.NewDecoder(bufio.NewReader(sout))
+	enc.Encode(map[string]string{"method": "version"})
+	var r map[string]interface{}
+	dec.Decode(&r)
+	sin.Close()
+	cmd.Process.Kill()
+	cmd.Wait()
+	if v, ok := r["version"].(string); ok { return v }
+	return "?"
+}
+
+func build(ver, out string) {
+	src := fmt.Sprintf(`package main
+import ("bufio";"encoding/json";"os")
+func main(){
+  dec:=json.NewDecoder(bufio.NewReader(os.Stdin))
+  w:=bufio.NewWriter(os.Stdout); enc:=json.NewEncoder(w)
+  for { var m map[string]interface{}
+    if err:=dec.Decode(&m); err!=nil {return}
+    enc.Encode(map[string]string{"version":%q}); w.Flush() }
+}`, ver)
+	os.MkdirAll("v", 0755)
+	os.WriteFile("v/main.go", []byte(src), 0644)
+	os.WriteFile("v/go.mod", []byte("module v\ngo 1.21\n"), 0644)
+	c := exec.Command("go", "build", "-o", "../"+out, ".")
+	c.Dir = "v"
+	if b, err := c.CombinedOutput(); err != nil { fmt.Println("build err:", string(b)) }
+}
+
+func main() {
+	fmt.Println("=== 实验 7：子进程模型下的热重载（迁移的原始目标）===")
+	build("v1.0.0", "hotbin")
+	fmt.Printf("1) 首次启动插件 → version = %s\n", spawnAndAsk("./hotbin"))
+
+	fmt.Println("2) 替换二进制为 v2.0.0（同路径，无需版本化 hash 目录）")
+	build("v2.0.0", "hotbin")
+	time.Sleep(200 * time.Millisecond)
+
+	v := spawnAndAsk("./hotbin")
+	fmt.Printf("3) 重启插件进程 → version = %s\n", v)
+	if v == "v2.0.0" {
+		fmt.Println("\n✅ 同路径替换即生效：无 NODELETE、无版本化路径、无线程泄漏")
+		fmt.Println("   对照 .so 模型：同路径 dlopen 复用旧映像，永远拿不到 v2")
+	}
+}