feat: add gh and sleep commands to safe commands list

[linw1995]

Summary

This PR addresses #143 by adding gh (GitHub CLI) and sleep commands to the safe commands list.

Changes

1. Sleep Command

• Added sleep command support
• Allows positional arguments for specifying duration
• Safe flags: --help, --version

2. GitHub CLI (gh) - Read-Only Operations

Added safe read-only gh commands:

• gh --help and gh --version
• gh issue list and gh issue view
• gh pr list and gh pr view
• gh repo view
• gh release list and gh release view

Use Cases

These additions enable:

• Automation workflows: Query issues and PRs, monitor CI runs
• Rate limiting: Add delays between API calls
• Monitoring: Watch repository status and releases
• Debugging: Test timing-dependent behavior

Security

All gh commands added are read-only operations (list/view only). Write operations like gh issue create, gh pr create, etc. remain restricted unless explicitly authorized.

Fixes #143

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.85%. Comparing base (a46f02c) to head (ea65418).
⚠️ Report is 6 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #144      +/-   ##
==========================================
- Coverage   50.22%   48.85%   -1.38%     
==========================================
  Files          93       95       +2     
  Lines       25033    26112    +1079     
==========================================
+ Hits        12574    12756     +182     
- Misses      12459    13356     +897     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.