feat: implement smart PR creation for feature tracker updates

[lgallard]

Problem

Current workflow creates PRs on every run, even when no new features are discovered. This leads to:

• PR spam from metadata-only updates
• Unnecessary maintenance overhead
• Git history noise from frequent scan metadata commits

Solution

Implement smart PR creation logic that only creates PRs for meaningful changes.

Changes Made:

Smart PR Logic:

• Only create PRs when ISSUES_CREATED > 0 (new features discovered)
• Skip PR creation for metadata-only updates
• Preserve scan logs in workflow output instead of creating noise commits

Enhanced Logging:

• Clear messaging when PR creation is skipped
• Informative workflow summary showing tracker update status
• Distinguish between "no changes" vs "metadata only" scenarios

Logic Flow:

if [ "$ISSUES_CREATED" -eq 0 ]; then
  echo "📊 Tracker updated with metadata only - skipping PR creation"  
  exit 0
fi
echo "🚀 Creating PR for tracker updates with $ISSUES_CREATED new issues"

Benefits:

• ✅ Eliminates PR spam from scheduled runs with no discoveries
• ✅ Maintains automated issue creation functionality
• ✅ Reduces maintenance overhead for repository maintainers
• ✅ Creates PRs only when meaningful changes occur
• ✅ Preserves audit trail for scan execution in workflow logs

Testing Plan:

• Test workflow with new feature discoveries (should create PR)
• Test workflow with no new features (should skip PR creation)
• Verify workflow summary shows correct tracker update status