Heatmap Year Stipple

A GitHub-style year activity calendar where intensity is stipple density, not color: every day cell holds a handful of deterministically jittered ink dots, denser for more activity, like an engraved print. Hovering or arrow-keying through days opens a zoomed loupe with the exact count, and each new day's dots spring into the loupe with a brief ink-settle scatter, like fresh ink landing on paper.