Guided pull request creation that enforces repository templates and safety standards.

• Enforces branch safety with critical checks to prevent commits and pushes to main
• Locates and applies repository-specific PR templates from .github/ directories, supporting multiple template variants
• Guides description drafting with template structure preservation, checklist completion, and issue linking
• Includes preflight validation via npm run preflight to catch build, lint, and test failures before PR creation
• Uses gh CLI with temporary files to safely handle multi-line Markdown descriptions and enforce Conventional Commits formatting