Add factual project vault entry for python-asteroid-game

[Copilot]

The task is to generate a factual, evidence-based JSON vault entry for the repository (no invented features, only verifiable details).

• Vault entry JSON: Added project_vault_entry.json capturing id, title, tagline, GitHub URL, tech stack, concepts, factual implementation bullets, architecture summary, complexity rating, and git-derived dates.
• Data fidelity: Values grounded in source code (pygame sprite groups, logging, collision/split logic) and git history for created/updated dates.

Example snippet:

{
  "id": "python_asteroid_game",
  "tech_stack": ["Python", "pygame"],
  "complexity": "low",
  "created_at": "2025-12-07"
}

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