no sockets. this page polls a 1-second manifest and fetches immutable
frame blobs — both cached by the CDN, so viewers cost the origin ~nothing,
however many there are. the cdn column shows where each response came from.
frames are cut by durable alarms. each 256×256 tile is its own
object with its own SQLite; it batches writes into single durable flushes and
renders a diff frame ~1/s, a full frame every 30 diffs.
forward-only: every pixel ever placed is a row, forever. inspect mode
shows who owns any pixel and since when.