Configure comprehensive Copilot instructions for repository

[Copilot]

Expanded .github/copilot-instructions.md from basic PR review guidelines (38 lines) to comprehensive repository context (165 lines) following GitHub Copilot best practices.

Added Sections

• Project Overview & Tech Stack - C#/.NET 10, WPF, MSBuild, NUnit, cross-platform DynamoCore
• Build Commands - Platform-specific dotnet/MSBuild invocations for Windows and Linux
• Code Standards - References to wiki-documented coding/naming conventions, EditorConfig rules, Roslyn analyzer requirements
• Project Structure - Directory tree showing src/test/doc/tools organization
• Contribution Guidelines - PR template requirements, API compatibility rules, semantic versioning
• Node Development - .dyn/.md/.jpg documentation requirements, .resx localization
• Security - No secrets, network connections, or telemetry without consent; file size limits
• Documentation Links - Wiki, developer resources, DynamoSamples

Preserved Content

All original PR review guidelines retained: node addition detection via [IsVisibleInDynamoLibrary(true)], required documentation files, API-breaking change alerts, coding standards verification.

Provides Copilot with persistent project context for better code generation, build command suggestions, and standards compliance.

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 #16827

---

💡 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.

[Copilot]

Pull request overview

This PR expands the .github/copilot-instructions.md file from basic PR review guidelines to comprehensive repository context documentation, providing Copilot with essential project information for code generation and standards compliance.

Changes:

• Added project overview, tech stack details, and build/test commands
• Documented code style requirements, project structure, and contribution guidelines
• Reorganized existing PR review rules into dedicated sections while preserving all original functionality
• Added security restrictions, API compatibility rules, and documentation links

[Copilot]

Grammatical error: 'Use the check_file_size.yml workflow validates this' should be either 'The check_file_size.yml workflow validates this' or 'Use the check_file_size.yml workflow to validate this'.

Suggested change

	- Use the check_file_size.yml workflow validates this
	- The check_file_size.yml workflow validates this