Auto-mode reserved 25% of the sidebar height for each of Plan / Todos
/ Tasks / Agents regardless of content, so on a typical 32-row sidebar
each slot was ~8 rows. With Todos/Tasks/Agents empty (the common case
when a goal is set but no checklist exists), Plan ended up with ~5
content rows of its 8-row slot consumed by header + token bar +
separator, and steps got silently clipped — the user-reported
"sidebar broken / Plan disappearing".
Build the constraint list dynamically: include a slot only for panels
that actually have content. Plan always renders (it owns the
session-wide empty hint). Todos/Tasks/Agents collapse to zero rows
when empty, letting the visible panels share the full height.
Hunter Bown
449312cf2b