Environment reference

Variable	Purpose
DRIFT_CONFIG	Explicit configuration file path.
DRIFT_PROFILE	Selected configuration profile.
DRIFT_ENDPOINT	Drift base URL override.
DRIFT_OUTPUT	human or json.
DRIFT_API_KEY	Bearer key for authenticated commands.

An authenticated command resolves its credential in this order:

1. standard input when --key-stdin is present;
2. DRIFT_API_KEY;
3. the variable named by the selected profile's credential_env.

Empty variables are errors rather than silent fallbacks. status requires no credential.