Add repository-derived AI skills catalog with harness-ready formats for Copilot, Codex, and Claude Code

[Copilot]

This issue asked for a practical set of reusable AI skills generated from the repository’s projects. This PR adds a focused skills catalog derived from chapter patterns and now provides harness-ready skill formats for VS Code Copilot, Codex, and Claude Code.

• Added AI skills catalog

  • New AI_SKILLS.md with 12 reusable development skills inferred from the chapter implementations.
  • Each skill includes:
    • when to use it
    • source chapter mapping
    • concise execution guidance for AI-assisted coding flows.

• Added harness-specific skill files and structure

  • VS Code Copilot: .github/skills/tiny-powershell-projects/SKILL.md
  • Codex: .agents/skills/tiny-powershell-projects/SKILL.md
  • Claude Code: .claude/commands/tiny-powershell-projects.md
  • Added required front matter to the harness skill markdown files.

• Connected skills to primary entrypoint

  • Updated README.md with an AI Skills section linking to the overview and each harness-specific entrypoint.

• Included prompt-ready usage

  • Added concrete prompt snippets users can copy into Codex/Cloud Code to apply repository patterns directly.

Example excerpt:

## 6) Implement reproducible randomness
- **Use when:** random output must be testable and repeatable.
- **Source chapters:** 09, 10, 12, 16
- **Skill instructions:** accept a seed parameter, initialize a deterministic random generator, and ensure tests can assert exact output for known seeds.

[dfinke]

Ensure the skills are in the format that the AI harness needs the AI harness can be visual studio code copilot, codex app from openai, or Claude code from anthropic.

The skills need to be in the proper directory folder structure and file names. In the markdown that describes the skills it needs to be the proper format with front matter etc. @copilot

[Copilot]

Ensure the skills are in the format that the AI harness needs the AI harness can be visual studio code copilot, codex app from openai, or Claude code from anthropic.

The skills need to be in the p...

Implemented in commit 9ffab05.

I added harness-specific skill files and paths with front matter and proper names:

• .github/skills/tiny-powershell-projects/SKILL.md (VS Code Copilot)
• .agents/skills/tiny-powershell-projects/SKILL.md (Codex)
• .claude/commands/tiny-powershell-projects.md (Claude Code)

I also updated README.md and AI_SKILLS.md to point to these entrypoints.

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:

• docs.anthropic.com
  • 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)