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## Summary
<!-- Provide a brief summary of the changes you have made and most
importantly what they aim to achieve -->
Adds GitHub Copilot instructions file to guide AI code generation with
project-specific conventions and patterns.
**Contents:**
- Code style enforcement (SwiftFormat, SwiftLint rules, 120 char width,
`before-first` wrapping)
- Custom lint rules (no `Current` assignments, SFSafeSymbols usage)
- Project architecture (multi-platform: iOS/watchOS/macOS/CarPlay)
- Build setup (CocoaPods, Xcode 15.3+, code signing requirements)
- Common patterns (dependency injection via `Current`, networking APIs,
database layer)
- Testing and CI expectations
## Screenshots
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screenshots in light and dark mode. -->
N/A - Documentation only
## Link to pull request in Documentation repository
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corresponding pull request in the Companion App Documentation repository
(https://github.com/home-assistant/companion.home-assistant). Please add
the number of this pull request after the "#" -->
Documentation: home-assistant/companion.home-assistant#
N/A - Internal development documentation
## Any other notes
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Request is part of a bigger change, please include it here. -->
None
<!-- START COPILOT CODING AGENT SUFFIX -->
<details>
<summary>Original prompt</summary>
> Add .github/copilot-instructions.md sample
</details>
<!-- START COPILOT CODING AGENT TIPS -->
---
💬 We'd love your input! Share your thoughts on Copilot coding agent in
our [2 minute survey](https://gh.io/copilot-coding-agent-survey).
---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: bgoncal <5808343+bgoncal@users.noreply.github.com>
