Event Propagation Matrix

A temporal background where application events propagate through a structured cell matrix (rows = regions/streams, cols = time/lanes) — origin cells light, then neighbors along the grid, so waves step cell-to-cell rather than as free-space circles. Overlaps are damped, failed propagation halts with a non-color glyph, acknowledged events dim, and old events settle into a quiet history layer. SVG + CSS only. Deterministic (SSR-safe), light/dark, reduced-motion shows current relationships statically, forced-colors-safe, offscreen-paused.