Implement Issue Skill

Implement a GitHub issue from start to finish: branch setup, codebase analysis, and implementation.

Prerequisites Check (MUST verify first)

Before proceeding, verify:

# 1. Check if in a git repository
git rev-parse --is-inside-work-tree

# 2. Check if gh CLI is available and authenticated
gh auth status

# 3. Check for uncommitted changes (warn user if any)
git status --porcelain