feat(gba): TATE vertical display mode (#25)

Add a second scaler_mode to video.json (160x240, 2:3, rotation:1) so
vertical/shmup players can select a 90-degree-rotated display from the
Pocket display menu. No HDL — the Pocket scaler handles rotation. The
default landscape mode (240x160) stays first/default. Needs a Pocket
to confirm the rotation direction/aspect.

arzacore snes v1.0.0 — first hardware-verified arzacore release

arzacore nes v1.0.0 — first hardware-verified arzacore release

arzacore genesis v1.0.0 — first hardware-verified arzacore release

arzacore gbc v1.0.0 — first hardware-verified arzacore release

feat(gba): TATE vertical display mode (#25)

Add a second scaler_mode to video.json (160x240, 2:3, rotation:1) so
vertical/shmup players can select a 90-degree-rotated display from the
Pocket display menu. No HDL — the Pocket scaler handles rotation. The
default landscape mode (240x160) stays first/default. Needs a Pocket
to confirm the rotation direction/aspect.

arzacore gba v1.0.0 — first hardware-verified arzacore release