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feat: support boolean (CV_Bool) images in imwrite - #29407 ## Summary `imwrite` failed on `CV_Bool` (boolean) images because no encoder handles that depth. This normalizes a boolean image to `CV_8U` (mapping true to 255) before encoding, so boolean masks can be written directly instead of requiring a manual `convertTo` at every call site. Adds round-trip tests covering boolean-image encoding. Fixes #29365 AI was used for assistance.