[WIP] ✨ Set up Copilot instructions

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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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>

<agent_instructions>@copilot<issue_title>copilot-setup-steps</issue_title>
<issue_description>/.github/copilot-instructions.md
/.github/instructions/**/*.instructions.md
**/AGENTS.md
/CLAUDE.md
/GEMINI.md</issue_description>@</agent_instructions>

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

Fixes #133

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