The demo fixture was one of ours against three of theirs, which cannot show anything the force layer does. `Scene` now owns a force each side, both mustered by the same call, and hands out a `Mover` and its own reachable set per unit of ours. The examples print a section and draw a panel row per unit. On the three corpus boards a 2v2 sweeps in 67 ms against 47 ms before, and the per-position record on `open` is 1.7 MB against 1.0 MB. Change-Id: I46b57e26b4e57d0c0f81f6d33eb9c5ac6c166213 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>