v0.5.0

• New game mode word in /viz3d and the Gemini CLI and OpenCode command files.
• README lists all eight modes and all twelve looks, with what each look fits.
• Fault lists say what went wrong and how to measure it, without names or dates.
• A fast low-quality preview of the whole film goes to the user before the full render.
• New self-review faults: floating plants, unfinished walls, bodies through seats, coplanar texture flicker, fake screen code.