feat: public histogram API - #76
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Adds Image::histogram_luma() (reusing the exact 256-bin BT.601 binning Otsu is built on) and Image::histogram_rgb() -> (r, g, b) bins. 4 new tests: bin sums equal pixel count, flat image concentrates in one bin (all others asserted empty), hand-counted mixed image, bimodal binning agreement. 167/167 tests passing. Closes #73