Initial FastAPI face-lock scaffold

tests/test_vision.py

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+import numpy as np
+
+from app.vision import BBox, crop_image, detect_salient_object, square_bbox
+
+
+def test_square_bbox_is_square_and_inside_bounds():
+    bbox = BBox(x=10, y=20, w=40, h=20)
+    square = square_bbox(bbox, (100, 120, 3), buffer_ratio=0.1)
+    assert square.w == square.h
+    assert square.x >= 0
+    assert square.y >= 0
+    assert square.right <= 120
+    assert square.bottom <= 100
+
+
+def test_crop_image_uses_bbox():
+    image = np.zeros((60, 80, 3), dtype=np.uint8)
+    image[10:30, 20:50] = 255
+    bbox = BBox(x=20, y=10, w=30, h=20)
+    crop = crop_image(image, bbox)
+    assert crop.shape[:2] == (20, 30)
+
+
+def test_detect_salient_object_finds_rectangle():
+    image = np.zeros((100, 100, 3), dtype=np.uint8)
+    image[25:75, 30:80] = 255
+    bbox = detect_salient_object(image)
+    assert bbox is not None
+    assert bbox.w >= 45
+    assert bbox.h >= 45