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/exp6.go

@@ -0,0 +1,49 @@
+//go:build ignore
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"time"
+)
+
+func main() {
+	fmt.Println("=== 实验 6：子进程崩溃隔离 + 退出码/EOF 作为 recordCrash 信号 ===")
+	cmd := exec.Command("./crashbin")
+	sin, _ := cmd.StdinPipe()
+	sout, _ := cmd.StdoutPipe()
+	cmd.Stderr = nil // 丢弃 panic 栈
+	cmd.Start()
+	fmt.Printf("插件进程 pid=%d 已启动\n", cmd.Process.Pid)
+
+	enc := json.NewEncoder(sin)
+	dec := json.NewDecoder(bufio.NewReader(sout))
+
+	// 正常调用
+	enc.Encode(map[string]string{"method": "ping"})
+	var r map[string]interface{}
+	if err := dec.Decode(&r); err == nil { fmt.Println("正常调用 → ", r) }
+
+	// 触发崩溃
+	fmt.Println("\n发送 boom（插件内 panic）...")
+	t0 := time.Now()
+	enc.Encode(map[string]string{"method": "boom"})
+	err := dec.Decode(&r)
+
+	detected := "未检测到"
+	if errors.Is(err, io.EOF) || err == io.ErrUnexpectedEOF { detected = "EOF" } else if err != nil { detected = fmt.Sprintf("%v", err) }
+	fmt.Printf("调用侧感知: %s (耗时 %v)\n", detected, time.Since(t0))
+
+	werr := cmd.Wait()
+	var ec int = -1
+	if ee, ok := werr.(*exec.ExitError); ok { ec = ee.ExitCode() }
+	fmt.Printf("进程退出码 = %d  （panic → 2，可直接喂 recordCrash）\n", ec)
+
+	fmt.Printf("\n宿主进程仍存活: pid=%d ✅ 崩溃已隔离\n", os.Getpid())
+	fmt.Println("→ 对照：当前 .so 模型下，bridge 兜不住的 panic 会带崩整个 homed")
+}