[Code Quality] Implement dry-run mode for workflow updates

[github-actions]

Description

The pkg/cli/update_command.go file contains a TODO for implementing dry-run mode for workflow updates (line 90). This feature would allow users to preview what changes would be made before actually updating workflows.

Suggested Changes

Implement dry-run functionality in the update command:

1. Add dry-run logic to UpdateWorkflowsWithExtensionCheck() function
2. When --dry-run is specified:
   • Detect which workflows would be updated
   • Show diff of proposed changes
   • Display update summary without making changes
3. Add tests for dry-run behavior

Files Affected

• pkg/cli/update_command.go (line 90 - remove TODO, implement feature)
• pkg/cli/update_workflows.go (add dry-run support)
• pkg/cli/update_command_test.go (add dry-run tests)

Success Criteria

• gh aw update --dry-run shows proposed changes without modifying files
• Output clearly indicates this is a dry-run (no actual changes)
• All existing update tests pass
• New tests verify dry-run behavior
• Update help text documents the --dry-run flag

Source

TODO comment in pkg/cli/update_command.go:90:

// TODO: Implement dry-run mode for workflow updates
return fmt.Errorf("--dry-run mode not yet implemented for workflow updates")

Priority

Low - Nice-to-have feature for safer workflow updates

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[github-actions]

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