gplay vitals (post-launch quality signals)

gplay vitals reads Android vitals: the rate presets below, error reports, and Play-detected anomalies. Shared conventions are in gplay-cli-usage.

Two things set this namespace apart:

• A distinct Google service. Vitals is backed by the Play Developer Reporting API, with its own OAuth scope. A service account invited only for publishing gets a 403 (exit 11) on every vitals call until the reporting scope is granted: an environment fix, not a flag.
• Read-only throughout: no --confirm, and GPLAY_READONLY never blocks it.

Preset rate commands: the fast path

One preset per vital, 28-day DAILY window by default: