follow up first commit

configs/calibration/CC3_homography.yaml

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+camera_id: CC3
+reference_object_cm: 60.0
+reference_object_px: 186.0
+notes:
+  - "Default ROI-corner calibration for CC3 (kandang_1)."
+  - "Maps counting ROI corners to an approximate 1860 x 390 cm floor patch."
+  - "Replace point pairs after visual audit with measured floor tile or feeder dimensions."
+points:
+  - {pixel_x: 20, pixel_y: 330, cm_x: 0, cm_y: 0}
+  - {pixel_x: 1880, pixel_y: 330, cm_x: 1860, cm_y: 0}
+  - {pixel_x: 1880, pixel_y: 720, cm_x: 1860, cm_y: 390}
+  - {pixel_x: 20, pixel_y: 720, cm_x: 0, cm_y: 390}