Add repository-specific AI skills in standard SKILL.md format

[Copilot]

This PR adds a set of reusable AI skills tailored to Tiny-PowerShell-Projects so they can be used from Copilot/Codex/Claude-compatible skill loaders. The skills are delivered in the expected folder/file layout with YAML front matter and actionable guidance.

• Added skills catalog

  • Created skills/README.md to index available skills and keep discovery simple.
  • Added six focused skills under skills/<skill-name>/SKILL.md:
    • tiny-ps-chapter-solver
    • tiny-ps-test-loop
    • tiny-ps-regex-text-transforms
    • tiny-ps-file-and-stdin
    • tiny-ps-deterministic-random
    • tiny-ps-pester-troubleshooter

• Standardized skill packaging

  • Each skill uses front matter (name, description, compatibility metadata, argument hints) plus concise execution guidance.
  • Structure follows skill-loader expectations: one folder per skill with a SKILL.md entrypoint.

• Embedded repository-specific workflows

  • Encoded chapter-oriented edit flow, local-vs-root test loop, and guardrails for minimal/surgical changes.
  • Captured common challenge patterns in this repo (regex transforms, stdin/file dual-input, deterministic random behavior, focused Pester debugging).

---
name: tiny-ps-test-loop
description: 'Use this skill to run the expected Tiny PowerShell Projects validation loop quickly (chapter tests first, then repository tests).'
compatibility: 'Cross-platform. Works with Copilot-compatible, Codex-compatible, and Claude-compatible skill loaders that support SKILL.md front matter.'
argument-hint: 'Optional: chapter directory to test first'
---

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:

• agentskills.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)
• https://api.github.com/repos/github/awesome-copilot/contents/skills
  • 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 (http 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)