Add true_density.dsn: NET_C is a full-height wall on the sole signal layer,
so plain room routing drops a net under every net ordering (an order-independent
obstruction, verified over all permutations), unlike rooms_shove_channel whose
plain drop fits under a reorder.
Test that shove recovers nothing on this board (shoves == 0, same routed set as
plain) while staying DRC-clean, and that the only difference from the recoverable
shove_channel is the wall's span. shove relocates a blocker into existing free
space; where the wall leaves no headroom there is nowhere to relocate to, so it
cannot manufacture density. The recover/fail boundary is the free-space boundary.
Ryan Malloy
99c3d20de5