Add Copilot instructions for repository

[Copilot]

Configures GitHub Copilot coding agent instructions per best practices to enable better AI-assisted development.

Changes

• Created .github/copilot-instructions.md with repository-specific guidance:
  • TypeScript monorepo structure using npm workspaces
  • Build/test commands: npm run build, npm run test
  • Package organization: core engine, metadata, drivers (mongo/knex), api, server, ui
  • Testing conventions: Jest with ts-jest, *.test.ts files in test/ directories
  • Architecture constraints: JSON AST queries (not string concat), dual-stack engine support, pluggable drivers

This enables Copilot to understand project structure, follow correct workflows, and maintain code standards when generating pull requests.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>✨ Set up Copilot instructions</issue_title>
<issue_description>Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Verify hooks/actions implementation and add comprehensive examples objectql#11

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.