CommandKind::Rollback (command ids rollback-*). The daemon freezes the command
into one transaction built like from_continuity: plan, sealed release and
installed release copied from the transaction that flipped the previous release;
no source, no build, source cleanup SkippedContinuity, no admitted generation.
It reaches the deployment brake and advance_static unchanged. The previous
release is derived from the newest Admitted static flip (control.cc + history.cc)
and the observed link, and refused as a rejected transaction when there is no
completed release, no previous release, current is not the newest flip, the
previous directory is gone, or an artifact digest drifted (new port method
verify_installed, also checked before any flip intent). Rollback counts as a
deploy for the busy and live-per-target checks. CLI: idunn rollback via
parse_up(kind); commit_deployment_command and submit take the kind.
Tests: control_plane::tests::static_rollback_ (7) and parse_rollback (1).
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Eureka
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