The CLI ships as a GitHub Release binary with a manual `chrome-use upgrade`,
but nothing told users a newer version existed — so releases didn't reach them.
Add a lightweight update check: each run reads a cached latest-version and, if
it's newer than the running binary, prints a one-line hint to STDERR (never
stdout, so --json stays clean): "⚠ chrome-use X.Y.Z is available — run
chrome-use upgrade". The cache is refreshed at most once a day by a DETACHED
`__update-check` worker (curl → GitHub latest release), so the current command
never waits on the network. Skipped for meta commands (upgrade/install/doctor/
__*/--version/--help), in CI, in daemon mode, and via
CHROME_USE_NO_UPDATE_CHECK / AGENT_BROWSER_NO_UPDATE_CHECK.
Verified: nag shows for a newer cached version, suppressed by the opt-out env +
on meta commands + when up-to-date; the detached worker writes the real latest
tag from the GitHub API.
leeguooooo
8432f6cd69