docs: add Dependabot configuration documentation

[github-actions]

Summary

Adds comprehensive documentation for the .github/dependabot.yml configuration file that was introduced in commit 30d356b.

Changes Made

Documentation Updates

1. workflow-reference.md - Added new "Dependabot Configuration" section including:

   • Complete configuration file walkthrough
   • Explanation of current settings (GitHub Actions monitoring, weekly schedule)
   • Customization examples for adding new package ecosystems
   • List of all supported package ecosystems
   • Common schedule options
   • Link to official GitHub documentation

2. automation-overview.md - Enhanced "Dependabot Auto-Merge" section with:

   • Brief configuration summary
   • Cross-reference link to detailed configuration documentation in workflow-reference.md

Documentation Gap Addressed

Prior to these changes, the documentation covered:

• ✅ Dependabot Auto-Merge workflow (how PRs are automatically merged)
• ✅ Dependabot labels and PR behavior

But was missing:

• ❌ Documentation of the .github/dependabot.yml configuration file itself
• ❌ What ecosystems are monitored (GitHub Actions)
• ❌ Schedule configuration (weekly on Mondays at 9 AM Central)
• ❌ How to customize for additional package ecosystems

This PR fills that documentation gap.

Testing

• Documentation follows existing style and structure
• Cross-references are accurate
• Code examples use proper markdown formatting (4 backticks)
• Information matches actual configuration in .github/dependabot.yml

Related Files

• .github/dependabot.yml - Configuration file being documented
• docs/workflow-reference.md - Primary documentation update
• docs/automation-overview.md - Cross-reference added

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Note: This is a documentation-only change with no functional impact.

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