Why: Agents must use configured CLIs for implementation and testing, while remaining free to inspect, plan, test, and iterate within bounded scope.
Evidence: Task-card contract tests and the full 430-test governance discovery pass with 19 existing skips; diff-check passes.
Impact: Defines three safe attempts per normal CLI, one emergency Codex attempt, fail-stop terminals, and mandatory apply/admit integration.
Refs: feature/agent-cli-enforcement