feat(amsd): meow_amsd 活动管理器一期 + am CLI (agent-212, 用户定案) — svcd托管(trigger=boot); 生命周期注册表(状态/时长/退出码/信号/崩溃计数+历史环形); launcher launch/exit/stdout管道捕获上报(logcat式,崩溃尾巴drain不丢); am status/list/history/start/kill(root门); crash双保险转发; S89预置conf

amsd f8d7f61b / am cfc4cbd4 / launcher 97c1b222(含字库扫描签名门控修CPU100%)
宿主+qemu全链路验证通过

patch_v2/meow_launcherd/main_menu.c

@@ -683,6 +683,33 @@ static unsigned long long apps_dir_sig(void)
     return sig;
 }
 
+/* M2.83 修补：字库目录签名（根+各 family 目录 mtime）。meow_font_scan_presets 内含逐套
+ * sha256 校验（gbk 套 6.8MB 级），绝不能每 2s 轮询全量扫——只在目录签名变化时扫。 */
+static unsigned long long fonts_dir_sig(void)
+{
+    char root[300];
+    snprintf(root, sizeof root, "/usr/data/mnt/sd_0/%s", MEOW_FONTS_CFG);
+    unsigned long long sig = 1469598103934665603ULL;
+    struct stat st;
+    if (stat(root, &st) != 0) return 0;
+    sig ^= (unsigned long long)st.st_mtime; sig *= 1099511628211ULL;
+    DIR *d = opendir(root);
+    if (d) {
+        struct dirent *de;
+        while ((de = readdir(d))) {
+            if (de->d_name[0] == '.') continue;
+            char p[400];
+            snprintf(p, sizeof p, "%s/%s", root, de->d_name);
+            if (stat(p, &st) == 0 && S_ISDIR(st.st_mode)) {
+                sig ^= (unsigned long long)st.st_mtime * 256 + (unsigned char)de->d_name[0];
+                sig *= 1099511628211ULL;
+            }
+        }
+        closedir(d);
+    }
+    return sig;
+}
+
 static void run_menu(struct app apps[MAX_APPS], int napps, int state,
                      long sim_tap_ms, long sim_exit_ms)
 {
@@ -700,6 +727,7 @@ static void run_menu(struct app apps[MAX_APPS], int napps, int state,
     long sim_tap_done = 0, sim_exit_done = 0;
     long meow_last_poll = 0;         /* M2.2：MeowOS 后台拔营（卡/网）轮询时间戳 */
     unsigned long long apps_sig = 0; /* M2.77：应用目录签名（0=未初始化，首圈建立基线） */
+    unsigned long long fonts_sig = 0; /* M2.83：字库目录签名（门控 scan_presets，防 2s 轮询 sha256 风暴） */
 
     load_config();   /* meow.conf on the card: bg_color etc. */
     menu_icons_load(apps, napps);   /* MD3：应用图标解码一次进缓存（不每帧解码） */
@@ -824,6 +852,45 @@ static void run_menu(struct app apps[MAX_APPS], int napps, int state,
 
         /* 阶段 D · M0：菜单/主屏循环内排空 IPC（非阻塞；应用可随时查询/声明路由） */
         meow_ipc_process();
+        /* AMSD_DESIGN §4.3：amsd `am start` → 消费 pending-start（仅菜单态/无前台 App 时拉起）。
+         * 镜像 sim-tap 启动路径：launch 后 menu_after_app_exit + dirty 重绘菜单。 */
+        {
+            char spkg[MEOW_APP_ID_MAX], sact[MEOW_ACT_MAX];
+            if (meow_ams_take_start(spkg, sizeof spkg, sact, sizeof sact)) {
+                if (state != 0) {
+                    snprintf(toast, sizeof toast, "AMS START: app list not ready");
+                    toast_ms = TOAST_MS;
+                } else {
+                    int idx = -1;
+                    for (int i = 0; i < napps; i++)
+                        if (!strcmp(apps[i].id, spkg)) { idx = i; break; }
+                    if (idx < 0) {
+                        snprintf(toast, sizeof toast, "AMS START: NO APP %s", spkg);
+                        toast_ms = TOAST_MS;
+                    } else {
+                        int ret;
+                        if (sact[0]) {
+                            char chain[MEOW_CHAIN_MAX]; int depth;
+                            if (resolve_chain(spkg, sact, chain, &depth) == MEOW_OK)
+                                ret = launch_activity(&apps[idx], chain);
+                            else {
+                                snprintf(toast, sizeof toast, "AMS: NO ROUTE %s/%s", spkg, sact);
+                                toast_ms = TOAST_MS; ret = 0;
+                            }
+                        } else {
+                            ret = launch_app(&apps[idx]);
+                        }
+                        if (ret != 0) {
+                            snprintf(toast, sizeof toast, "CANNOT START: %s", apps[idx].name);
+                            toast_ms = TOAST_MS;
+                        }
+                        menu_after_app_exit(ret == 0);
+                        last_input_ms = now_ms();   /* M2.17：回主界面即视为输入 */
+                        dirty = 1;
+                    }
+                }
+            }
+        }
         meow_notif_tick();   /* M2a：通知 TTL 10s 转储（§8）*/
         meow_media_tick();   /* 阶段D附录B：媒体源死亡（播放中无 META 超时）清槽回空态 */
 
@@ -898,7 +965,15 @@ static void run_menu(struct app apps[MAX_APPS], int napps, int state,
                 int was_nocard = (state == 1);
                 if (!mfont_ready && meow_font_ensure()) { dirty = 1; logmsg("hotplug: font loaded late"); }
                 if (mfont_ready) meow_font_reload_multifont();   /* M2.5x：卡挂载后重配多字体（此前无全局可配） */
-                meow_font_scan_presets();   /* M2.82+：卡就绪后重扫字库（启动时卡未挂载会只有默认项） */
+                /* M2.83 修补：字库重扫改为签名门控——扫描含逐套 sha256（gbk 套 6.8MB 级），
+                 * 每 2s 全量扫会把 CPU 烧满（真机实测 100%）。只在字体目录签名变化时扫。 */
+                {
+                    unsigned long long fsig = fonts_dir_sig();
+                    if (fsig != fonts_sig) {
+                        fonts_sig = fsig;
+                        meow_font_scan_presets();
+                    }
+                }
                 if (was_nocard || state != 0 || napps == 0) {
                     struct app fresh[MAX_APPS];
                     int fn = scan_apps(fresh);