Migrate AI assistant guidelines from .junie to agent.md

[Copilot]

Changes proposed in this pull request

• Migrate Source/.junie/guidelines.md to agent.md at repository root for broader AI assistant compatibility (Copilot, Claude, Junie, Cursor, etc.)
• Enhanced guidelines with prerequisites, build instructions, project structure table, and additional resources
• Updated NETworkManager.sln Solution Items reference to new location

Related issue(s)

• Requested migration for multi-AI assistant flexibility

Copilot generated summary

Copilot summary

This PR moves AI coding guidelines from a Junie-specific location to a universal agent.md at repository root. The new file removes Junie branding, adds comprehensive project documentation including build commands and project structure, and is now referenced in the solution file as a Solution Item.

To-Do

• Update documentation to reflect this changes
• Update changelog to reflect this changes

Contributing

By submitting this pull request, I confirm the following:

• I have read and understood the contributing guidelines and the code of conduct.
• I have have added my name, username or email to the contributors list or don't want to.
• The code or resource is compatible with the GNU General Public License v3.0.

Original prompt

can you migrate the Source/.junie/guidelines.md to an agent.md to be more flexible for copilot, claude, junie, etc.
Also analyze the whole project if anything is missing.

---

💡 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.