Mobile (375px) had ~55px horizontal scroll caused by grid tracks
defaulting to min-content across nowrap text in Install, AgentInstall,
and CommandCenter sections. Replace implicit/`1fr` tracks with
`minmax(0, 1fr)` so tracks can shrink below their content and let
`overflow: hidden` / `text-overflow: ellipsis` actually clip.
Also tightens padding, font-size, and letter-spacing at <=640px for
Install boxes, AgentInstall snippet head/code/copy row, CommandCenter
tabs and launch strip, and Stats tiles so dense uppercase content stops
crowding itself at mobile widths.
Adds app/opengraph-image.tsx and app/twitter-image.tsx using
next/og ImageResponse, statically prerendered at build (no edge
runtime) so socials get a real 1200x630 preview instead of the blank
card the site was shipping before.