__DSL41_SUMMARY__
click selects one node and opens its details, shift+click toggles one · shift+drag the background selects a region, and adds it · right-click a node, or the canvas for the selection, to add a walk · double-click a box, or its corner cue, to collapse or expand it · Escape closes a menu or controls/help panel, else empties the find field you are typing in, else clears the selection
drag pans, wheel zooms · dragging a selected node moves the whole selection · a node otherwise moves only when a layout runs: at load, on “arrange”, or after a hide op with “arrange after hiding” on · there is no undo, and arrange is the recovery
all incoming arrows must hold (AND) unless the job carries ∨ · a bare n() is a lock and draws no arrow
dotted gray = lock · the tee marks the job that waits