chore: document demo-assets submodule and hypercomposed Caspar path

[kubo6472]

• Extend AGENTS.md for fourth submodule (demo-assets), build commands, dev server
• Note hypercomposed playout WIP and LED vs PGM topology reference

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Reviewing files that changed from the base of the PR and between 3da05a2 and b64a696.

📒 Files selected for processing (1)

• AGENTS.md

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch cursor/chore-assets-submodule-hypercomposed-docs

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