fix(tool): require PR template check before creating PRs

[scarf005]

Summary

Adds mandatory PR template checking to bash tool's PR creation workflow, using Glob tool for flexible discovery and providing a fallback format.

Problem

The bash tool's "Creating pull requests" section had a hardcoded example format (## Summary) that agents would blindly follow, ignoring project-specific PR templates.

Solution

1. Use Glob tool instead of hardcoded paths to find:

   • **/pull_request_template.md, **/PULL_REQUEST_TEMPLATE.md
   • **/AGENTS.md, **/CONTRIBUTING.md

2. Provide fallback format when no template exists:

   ## Summary
   - Concise description of changes (1-3 bullet points)
   
   ## Changes
   - List key modifications
   

3. Removed hardcoded example that caused agents to ignore templates

Changes

• Step 1: Use Glob to find template files (not hardcoded paths)
• Step 3: Follow template if found, otherwise use fallback format
• Added explicit fallback structure for projects without templates
• Removed misleading example section

Impact

Agents will now:

1. Use Glob to flexibly find templates anywhere in repo
2. Follow project templates when they exist
3. Use a consistent fallback format when no template exists
4. Not blindly use hardcoded formats