A first-ever ddev start pulls several GB across the webserver, db,
router, and ssh-agent images, which reads as the app hanging rather
than as an expected download. Warms the cache automatically once per
DDEV version (re-warms after a DDEV upgrade, since image tags are
versioned) using `ddev version --json-output` to discover the exact
default image tags — stays correct without hardcoding image names.
Runs fire-and-forget right after window creation so it never blocks
app startup or usage, and no-ops quietly if ddev/docker aren't
available yet.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
