Docs: Deep project analysis, documentation updates, and submodule tracking

[robertpelloni]

• Created VISION.md, MEMORY.md, DEPLOY.md, TODO.md in the root directory to fulfill user documentation requirements.
• Updated AGENTS.md, CLAUDE.md, GEMINI.md, GPT.md, copilot-instructions.md, and LLM_INSTRUCTIONS.md to reference the universal instructions.
• Safely appended the latest session state and next steps to HANDOFF.md.
• Added missing references as submodules: defold, love2d, phaser, and bobui.
• Fixed the git submodule tracking for voidsprite and grafx2.
• Bumped the version to 2.0.31 in VERSION.md and updated the CHANGELOG.md.
• Refactored UNIVERSAL_LLM_INSTRUCTIONS.md to restore lost historical context.

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PR created automatically by Jules for task 8356211922684761209 started by @robertpelloni

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