[SlipstreamSurfer]

What changed

• Adds eight independently addressable LED bars along the stage roof, evenly placed between the rear-truss washes.
• Adds one upper spot per mirrored back tower, above its three existing beams.
• Adds geometry checks for the tower spots and roof-bar spacing.

Validation

• Full Godot 4.7.2 suite passed.
• Linux, Windows and macOS packages exported; Linux smoke test passed.
• Captured a local GPU render with generated 128 BPM audio.