pixelcanvas/v0 package

Package pixelcanvas is a shared 16x16 pixel canvas: anyone can paint one cell at a time from a fixed 9-colour palette, and the canvas renders in gnoweb as a grid of coloured blocks.

The canvas is a flat [Size*Size]int of palette indices held in realm state — a fixed-size array rather than a tree, because every cell exists from the start and the grid is walked in full on every render. Painting is last-write-wins; the realm keeps who painted each cell and a per-address tally, so the board doubles as a contribution leaderboard.

A stateful app with nothing reusable to extract, so it ships as a lone realm rather than a p/ library + demo pair.