Add Copilot instructions for repository

[Copilot]

Configures GitHub Copilot coding agent instructions per best practices to provide context about this Home Assistant custom integration.

Changes

• Created .github/copilot-instructions.md with:
  • Project context: HA custom integration for SPAN Panel circuit-level monitoring
  • Tech stack: Python 3.13.2+, HA 2025.12.4, Poetry, MyPy/Ruff/Bandit toolchain
  • Coding standards: Import rules (absolute, top-level only), type hints, docstrings, async patterns
  • Development commands: setup, test, lint, format workflows
  • Boundaries: 10 forbidden actions (e.g., no pip, no imports in functions, no breaking entity IDs without migration)
  • Patterns: DataUpdateCoordinator, ConfigFlow, entity naming conventions
  • Testing guidelines and common code patterns

The instructions guide Copilot on repository structure, Home Assistant integration patterns, and critical constraints like entity ID stability and energy statistics handling.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• gh.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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 ✨ Set up Copilot instructions #164

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

---

Note

Introduces a comprehensive guide for Copilot and contributors to align with this Home Assistant custom integration.

• Adds /.github/copilot-instructions.md detailing project context (SPAN Panel HA integration), tech stack/tooling, and repo structure
• Defines coding standards: absolute/top-level imports, strict typing/docstrings, line length/formatting, async I/O, coordinator/config flow patterns
• Documents development commands for test, lint, type-check, format, security, and complexity
• Specifies boundaries: forbidden actions (e.g., no pip, no in-function imports), files not to modify, and areas requiring caution (entity migrations, energy stats, auth)
• Provides testing guidelines, common code patterns, naming conventions, and references

^{Written by Cursor Bugbot for commit d553c7f. This will update automatically on new commits. Configure here.}