feat: add support for wave code

[lewis617]

This PR introduces support for Wave Code, an AI coding agent developed by NetEase.

Notably, Wave Code was developed using the Spec Kit framework itself, serving as a prime example of "dogfooding" and demonstrating the effectiveness of Spec-Driven Development (SDD) in building production-ready AI tools.

Key Highlights:

• Wave Code Integration: Full support for the NetEase Wave Code agent, including directory conventions and slash command templates.
• Spec-Driven Development: Wave Code's own development journey leveraged Spec Kit to maintain high quality and clear specifications.

Detailed Changes:

• Wave Code Support:
  • Added Wave Code to AGENT_CONFIG in the Specify CLI.
  • Updated README.md and AGENTS.md with Wave Code documentation and directory conventions (.wave/).
  • Included Wave Code in release package generation scripts (create-release-packages.sh and create-release-packages.ps1).
  • Added Wave Code support to agent context update scripts (update-agent-context.sh and update-agent-context.ps1).
• CLI Improvements:
  • Added a new version command to display CLI and template version information along with system diagnostics.
  • Improved GitHub API rate-limit handling with detailed error messages and troubleshooting tips.
• Documentation:
  • Updated AGENTS.md to reflect recent changes in Copilot agent paths and Markdown formats.
  • Added instructions for updating PowerShell release scripts when adding new agents.