Add use-case-risk-tier.py, a stdlib-only CLI that classifies an AI use case
(data sensitivity, autonomy, exposure, decision impact) into a low/medium/high
governance tier and the controls that tier requires, with --json and --dry-run.
Ship test_use_case_risk_tier.py covering scoring, tier forcing, validation,
CLI exit codes, graceful failure, and deterministic/dry-run behavior.
Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>
Magnus Hedemarkandfactory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>