Add colour-histogram fingerprint and change detection#356
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| Metric | Results |
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| Complexity | 28 |
| Duplication | 0 |
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image_dedupfingerprints with a perceptual aHash/dHash (a spatial hash, brittle to colour/theme shifts) andcolor_statsreports one average/dominant colour. A normalized colour histogram is the standard illumination/scale-robust "is this the same view, or has the palette shifted?" signal (theme switch, content reload, rotated banner).image_histogram(AC_image_histogram): per-channel normalized histogram as a flat list;spacehsv/rgb/gray,binsper channel.compare_histograms: correlation / chisqr / intersection / bhattacharyya (similarity vs distance methods).histogram_changed(AC_histogram_changed): compares a reference against the live screen / current image, auto-flipping the threshold direction for similarity vs distance methods.color_region's RGB loader (no copy); injectable image → headless-testable (synthetic swapped-palette proves the change detection). Base OpenCV (cv2.calcHist/compareHist). Wired through all 5 layers + headless test + EN/Zh docs + WHATS_NEW. Qt-free.