fix(launcher): 开机亮度停100竞态 (agent-230) — settings未读到前不盲写100, 挂起+读到后补应用; launcher aa6c95a4→8ebae666; 宿主4场景PASS

patch_v2/meow_launcherd/test_settings_brightness.c

@@ -0,0 +1,73 @@
+/* test_settings_brightness.c — M2.86 宿主测试：settings.conf「未读到」vs「已读到」的亮度语义。
+ *
+ * 直接 #include "meow_settings.c"（同 TU 平移其 static 常量/函数，与 test_notif_tf.c 把
+ * meow_notif.c 平移进 TU 的既有模式一致）；编译期用 -DMEOW_SETTINGS_FILE 覆盖存储路径
+ * （meow_settings.c 注释即声明该宏可编译期覆盖，宿主可直接测）。
+ *
+ * 验证的核心（开机亮度停在 100 的根因修复）：
+ *   1) meow_settings_loaded()==0：settings.conf 不可读（S70 早启动 /usr/data 未就绪）→
+ *      apply_user_brightness 必须据此挂起，而不是把 display.brightness 默认 101→clamp 100 盲目写盘。
+ *   2) meow_settings_loaded()==1：文件读到 → 用户设定/键缺失默认可信。
+ *   3) meow_settings_brightness_clamped() 的回退语义：文件缺失时确实回退 100（危险值），
+ *      但此时 loaded()==0 才是调用方要不要写盘的判据。
+ */
+#include "meow_settings.c"
+
+#include <assert.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main(void)
+{
+    const char *conf = MEOW_SETTINGS_FILE;   /* 编译期覆盖的路径（需为可写临时文件路径） */
+    FILE *f;
+
+    /* 场景 A：/usr/data 未就绪 → 文件不存在 → loaded==0，clamp 回退 100（危险值，但 loaded==0 提示调用方挂起） */
+    unlink(conf);
+    assert(meow_settings_init() == MEOW_OK);
+    assert(meow_settings_loaded() == 0);
+    int v = meow_settings_brightness_clamped();
+    assert(v == 100);
+    printf("[A] file absent : loaded=%d brightness_clamped=%d  (expect 0 / 100)\n",
+           meow_settings_loaded(), v);
+
+    /* 场景 B：文件存在且用户设 60 → loaded==1，clamp 60（用户设定可信） */
+    f = fopen(conf, "w");
+    assert(f);
+    fprintf(f, "# meow-settings 1\ndisplay.brightness=60\ndisplay.brightness_min=1\n");
+    fclose(f);
+    assert(meow_settings_init() == MEOW_OK);
+    assert(meow_settings_loaded() == 1);
+    v = meow_settings_brightness_clamped();
+    assert(v == 60);
+    printf("[B] file =60     : loaded=%d brightness_clamped=%d  (expect 1 / 60)\n",
+           meow_settings_loaded(), v);
+
+    /* 场景 C：文件存在但键缺失（仅注释/头）→ loaded==1，默认 101→clamp 100（「已读到→键缺失走默认」） */
+    f = fopen(conf, "w");
+    assert(f);
+    fprintf(f, "# meow-settings 1\n");
+    fclose(f);
+    assert(meow_settings_init() == MEOW_OK);
+    assert(meow_settings_loaded() == 1);
+    v = meow_settings_brightness_clamped();
+    assert(v == 100);
+    printf("[C] file no key : loaded=%d brightness_clamped=%d  (expect 1 / 100)\n",
+           meow_settings_loaded(), v);
+
+    /* 场景 D：文件存在但持久值 101 → clamp 到 100（防闪屏上限，M2.39） */
+    f = fopen(conf, "w");
+    assert(f);
+    fprintf(f, "display.brightness=101\ndisplay.brightness_min=1\n");
+    fclose(f);
+    assert(meow_settings_init() == MEOW_OK);
+    assert(meow_settings_loaded() == 1);
+    v = meow_settings_brightness_clamped();
+    assert(v == 100);
+    printf("[D] file =101    : loaded=%d brightness_clamped=%d  (expect 1 / 100)\n",
+           meow_settings_loaded(), v);
+
+    unlink(conf);
+    printf("ALL PASS\n");
+    return 0;
+}