Shell Pilot 1.13.1

Fixed the Metal terminal cursor drift by patching SwiftTerm's Metal renderer so glyph placement stays aligned with terminal cell columns.

• Vendored SwiftTerm locally so the Metal renderer fix ships with the app
• Kept the Terminal renderer setting for switching between CPU and Metal rendering
• Continues to fall back to CPU rendering if Metal initialization fails
• Retains the 60 fps cap for the Metal renderer