Color Block Jam Exit Queue: Stage Blocks Without Trapping Them

When is an exit queue useful?

Use it when multiple colors appear to depend on one exit or narrow route. The queue makes the shared constraint visible before you commit to a blocking move.

What makes a good queue?

The first block should open or preserve access for the next block. Every later block must have a staging position that does not occupy the exit prematurely.

What if the queue fails?

Check whether a gate or key changed the dependency. If not, the likely error is an early staging move that consumed the shared lane.