scripts/og.mjs renders each non-draft post's card front: hydra posts get a
real frame of their sketch (source resolved through lib/hydra-sketch.js,
booted headless on a bare canvas, five candidates between 4s and 12s, the
most detailed wins), other posts a standalone typographic card in Source
Serif 4 over the site's paper/ink tokens with a seeded tick-field motif.
PNG when it fits the budget, JPEG q~92 otherwise. --video cuts a ping-pong
og.mp4 for hydra posts (forward + reverse is the honest loop for a feedback
sketch). The og image of a hydra sketch is a render of the author's
CC-licensed artwork — attribution stays on the page.