按"硬件问题、配置不变"收尾：记录里写下实测帧率，探针加逐颗验收模式 - What: worker 把本会话实测到的采集速率记进 self._measured_capture_fps（box 与 finger 两条循环都算：finger 的帧率也从"1 秒窗口内计数"改成 (n-1)/span 的速率，两条视图对 fps 的含义必须一致），capture_status() 因此多出 measured_fps —— session.json 的 capture 块现在同时有 requested / negotiated / measured_fps / dropped_frames，一颗摄像头到底交付了多少 fps 由记录自证。status.capture_slow 的中英文案改写：删掉已被实测否证的"降低分辨率/换格式"建议，改成"这是采集端（摄像头/驱动）的问题、软件改不了，换一颗真能交付 30 fps 的（并先确认线材/端口没把它降速）再测"。tools/camera_probe.py 新增 --check 验收模式：只测 bundle 用的那一个格式（MJPG 1920x1080@30，120 帧），按**实测**速率打印一行 PASS/FAIL 并给出退出码，用于逐颗过检；无摄像头时报 "No camera answered on index N (is the app closed?)" 并返回 1。tests：假设备用上 capture_status() 的 measured_fps（0.05 s 粒度等它出现，断言 20–35 fps）、探针 --check 的无摄像头路径。 - Why: 用户判定这是驱动/硬件问题（同型号产品此前能跑 30 fps），决定**配置不变**、以后用能到 30 fps 的产品，并在之后逐颗检测。配置不变意味着应用继续按 30 fps 申请（这是对的：申请 15 只会把问题上移），但由此产生两件必须收尾的事：(1) 提示语里"降低分辨率/换格式"是错的建议——探针已经证明 720p MJPG 一样是 15 fps、YUYV 只有 1 fps；(2) 既然要逐颗检测，就必须有一个能回答"这一颗交付了多少"的权威数字，而驱动自报值不可信（DSHOW 回读），所以把实测值写进记录并给探针一个单行验收模式。 - Verification: shared 全量 161 passed；studio 91 passed；ui_check 554 项检查 0 失败；locale_check 中英键集一致；探针 --check 在无摄像头时打印指定文案并返回 1，--help 列出该选项。 - Not in this change: 未改任何采集配置（resolution_raw/fps/fourcc 都不动）；未做自动降级；frames.csv 仍未记录 process_ms/capture_fps（留到加未滤波 17 列、记录格式升版时一起）。

apps/studio/tools/camera_probe.py

@@ -175,13 +175,56 @@ def size_sweep(index: int, backend_name: str, backend: int, fps: float = 30.0,
     return rows
 
 
+def check_format(
+    index: int,
+    *,
+    request: tuple[str, int, int, float] = REQUESTS[0],
+    samples: int = 120,
+) -> int:
+    """Acceptance mode: does this camera deliver the bundle's format?
+
+    One line, one exit code, for going through units in turn. The request is the
+    one the sensor bundles make (MJPG 1920x1080@30); the verdict is the *measured*
+    rate, because the reported one is an echo.
+    """
+    fourcc, width, height, fps = request
+    for backend_name, backend in BACKENDS:
+        result = probe(index, backend_name, backend, request, samples=samples)
+        if result is None:
+            continue
+        measured = result["measured_fps"]
+        asked = f"{fourcc} {width}x{height}@{fps:g}"
+        if measured >= fps * TOLERANCE:
+            print(f"PASS  camera {index}: {asked} -> {measured:.1f} fps "
+                  f"[{backend_name}, {result['fourcc']}]")
+            return 0
+        print(
+            f"FAIL  camera {index}: {asked} -> {measured:.1f} fps "
+            f"(reported {result['reported_fps']:.1f}, {result['fourcc']}, "
+            f"{backend_name})"
+        )
+        return 1
+    print(f"No camera answered on index {index} (is the app closed?).")
+    return 1
+
+
 def main(argv: list[str] | None = None) -> int:
     parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
     parser.add_argument("--index", type=int, default=None, help="camera index to probe")
     parser.add_argument("--max-index", type=int, default=4, help="highest index to try")
     parser.add_argument("--samples", type=int, default=SAMPLES, help="frames per row")
+    parser.add_argument(
+        "--check",
+        action="store_true",
+        help="acceptance mode: measure the bundle's format once, exit 0 when it "
+             "delivers it (use this to go through units)",
+    )
     args = parser.parse_args(argv)
 
+    if args.check:
+        return check_format(args.index if args.index is not None else 0,
+                            samples=args.samples)
+
     indices = [args.index] if args.index is not None else list(range(args.max_index + 1))
     found = 0
     for index in indices: