CLI reference
Machine-facing commands support --json with schema_version=1 and diagnostics on stderr. ach --help lists command flags.
Exit codes: 0 successful operation (gates only for passing validation); 1 failed/incomplete validation; 2 invalid usage/configuration; 3 runner/storage error; 4 wait expiration. A successful status query may report a failed check.
Useful selectors: --repo ., --commit SHA, --run ID, --check NAME. History uses --limit 50 --cursor TOKEN; logs use --offset 0 --limit 65536. wait --timeout 60 never terminates checks.