Patch Delivery

Draw one network's copy of a post its own way: the picture, or one of the video templates, while that copy still waits. None goes back to the post's.

Held to what the worker will need, like the post's own template (_redraw): a renderer, a game, and a network and placement that take a clip this long — Threads takes none. Stored only where it differs from the post, so changing the post's template still moves every network that was never set apart.