chore(docs): document ScoreExtractor tiling and refactor debug scripts (#563)

scripts/debug/debug_stitch.py

@@ -0,0 +1,21 @@
+import cv2
+import numpy as np
+
+cap = cv2.VideoCapture("output/サカナクション／新宝島(エレキギターTAB) 難易度★★★ sakanaction shintakarajima.mp4")
+
+# Skip to 30 seconds
+fps = cap.get(cv2.CAP_PROP_FPS) or 30.0
+cap.set(cv2.CAP_PROP_POS_FRAMES, 30 * fps)
+
+ret, frame_30s = cap.read()
+if ret:
+    cv2.imwrite("C:/Users/Certes/.gemini/antigravity/brain/975cea00-dd68-4689-9ee3-f1a2408b4ee6/raw_frame_30s.png", frame_30s)
+    
+# Skip to 35 seconds
+cap.set(cv2.CAP_PROP_POS_FRAMES, 35 * fps)
+ret, frame_35s = cap.read()
+if ret:
+    cv2.imwrite("C:/Users/Certes/.gemini/antigravity/brain/975cea00-dd68-4689-9ee3-f1a2408b4ee6/raw_frame_35s.png", frame_35s)
+    
+cap.release()
+print("Saved raw frames for structural analysis.")