pub fn install_write_policy(policy: WritePolicy)Expand description
Installs the target policy for this process. Idempotent, first call wins.
Called from crate::cli::GlobalArgs during flag validation, which is the
one hook that runs after the command line is parsed and before any handler
executes. Absent — the library used directly, or a unit test — resolution
stays permissive, because the rule governs the CLI contract and not the API.