docs: add quick test example and guidance for AI agents #341
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Adds a concise 'Quick test example' (copy-paste) to .github/copilot-instructions.md to help AI agents and contributors get started with repository tests, and updates guidance on where to add features and tests.\n\nSee: src/jest-tests/unit/js/JSDebugMessage/detectAll/detectAll.test.ts for more examples.