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/01-dlclose-nodelete/exp01c/main.go

@@ -0,0 +1,58 @@
+//go:build ignore
+
+package main
+
+/*
+#cgo LDFLAGS: -ldl
+#include <dlfcn.h>
+#include <stdlib.h>
+typedef char* (*verfn)(void);
+static char* call_ver(void* f){ return ((verfn)f)(); }
+*/
+import "C"
+import (
+	"fmt"
+	"os"
+	"strings"
+	"unsafe"
+)
+
+func threads() int {
+	e, _ := os.ReadDir("/proc/self/task")
+	return len(e)
+}
+func rss() int {
+	b, _ := os.ReadFile("/proc/self/status")
+	for _, l := range strings.Split(string(b), "\n") {
+		if strings.HasPrefix(l, "VmRSS:") {
+			var k int
+			fmt.Sscanf(l, "VmRSS: %d kB", &k)
+			return k
+		}
+	}
+	return 0
+}
+func main() {
+	base, baseT := rss(), threads()
+	fmt.Printf("基线: RSS=%dKB threads=%d\n\n", base, baseT)
+	src, _ := os.ReadFile("glv1.so")
+	os.MkdirAll("stress", 0755)
+	var hs []unsafe.Pointer
+	for i := 1; i <= 30; i++ {
+		p := fmt.Sprintf("stress/%010d-qq.so", 1700000000+i)
+		os.WriteFile(p, src, 0755)
+		cp := C.CString("./" + p)
+		h := C.dlopen(cp, C.RTLD_NOW|C.RTLD_LOCAL)
+		C.free(unsafe.Pointer(cp))
+		if h == nil { fmt.Printf("第 %d 次失败\n", i); break }
+		hs = append(hs, h)
+		C.dlclose(h) // 模拟每次都尝试卸载（no-op）
+		if i%10 == 0 {
+			fmt.Printf("第 %2d 次重载: RSS=%dKB (+%dKB) threads=%d (+%d)\n",
+				i, rss(), rss()-base, threads(), threads()-baseT)
+		}
+	}
+	fmt.Printf("\n30 次重载后: RSS 增长 %dKB, 线程增长 %d\n", rss()-base, threads()-baseT)
+	fmt.Printf("每次重载均摊: RSS +%.1fKB, 线程 +%.2f\n",
+		float64(rss()-base)/30, float64(threads()-baseT)/30)
+}