Keep one control per decision link and say when nothing will link

The linked note is now the only way to the document from a resolved
card. Pending reads Not linked yet, without a pulse, when no Planner will
review it, and Writing up only while a conversation paragraph is being
written. Resolved card footers get bottom padding.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>