Add an optional hero field to the blog schema; render it on the post page and
as the index card thumbnail. Ship 4 verified Nano Banana hero images (shipping/
init-gating/authentik/workload) as optimized webp (64-134KB). Publish the
secret-zero post. (outbound hero pending — its file was a dup of shipping;
secret-zero hero pending generation.)
Light mode: revert the heavy white-out scrim back to a moderate wash so the
board stays visible, and earn legibility with a soft light text-halo behind
running text instead (invisible on the solid cards, only works over the image).
Pairs with the darker light-mode text tokens.
Also append ?v=2 to every /diagrams/*.svg reference so the recoloured diagrams
bypass Cloudflare's 4h edge cache and show immediately (the SVG URLs aren't
content-hashed like the CSS bundle).
jwright