audit-5: CLI send path uses the tested code, failures audited, non-zero exit
Note: the send-path refactor (send_approved CLI -> _send_approved with factory, send_failed audits in their own transaction, DaemonRun record, non-zero exit on any failure class) landed within the audit-1 commit — maild.py was staged whole. This empty commit marks the point in the review trail; the behavior is covered by test_send_failures_audited_and_ exit_code.
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