fix: add CI/CD YAML validation hook for branch name escaping (Fixes #174)

[laurentketterle-hub]

Fix: CI/CD YAML Validation for Branch Name Escaping

Fixes #174

Problem

When monk.cicd.setup generates .github/workflows/deploy.yml with branch names containing quotes (e.g., feature"quoted), the resulting YAML is invalid. Setup reports success but GitHub cannot load the workflow.

Solution

This PR adds a PostToolUse hook that runs automatically after every monk.cicd.setup call:

1. scripts/validate-cicd-yaml.sh (Linux/macOS)

   • Detects malformed branch name quotes in deploy.yml
   • Attempts auto-fix by replacing problematic patterns
   • Uses Python's yaml parser for deep validation when available
   • Creates timestamped backups before any fix

2. scripts/validate-cicd-yaml.ps1 (Windows)

   • Equivalent PowerShell implementation
   • Same detection, warning, backup, and auto-fix logic

3. Hooks registration — Matched to monk.cicd.setup in hooks.json PostToolUse

How it works

After monk.cicd.setup completes:

• Hook checks .github/workflows/deploy.yml for malformed quoting
• If valid → silent exit 0
• If issues detected → warns user, creates backup, attempts auto-fix
• Clear error messages reference this issue for context

Testing

• Hook runs in <1 second for valid files
• Timestamped backups prevent data loss
• Graceful fallback when Python/PyYAML not available