distribution's two windows and the builder's old-form window each closed for good on a read that named
no node (an empty node_haves, an unread placement): the second of a kind (security-upgrade review F3).
delivery.StepWindow over delivery.WindowHeld is the one rule both call; a read naming no node judges
nothing, as a first view's empty answer at revision 0 (ADR 0615).
Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig
