[plan] Rename WorkflowStep in copilot_setup.go to avoid type name collision

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Objective

Rename the WorkflowStep type in pkg/cli/copilot_setup.go to CopilotWorkflowStep to eliminate naming confusion with the comprehensive WorkflowStep type in pkg/workflow/step_types.go.

Context

Two WorkflowStep types currently exist with different field sets:

• pkg/workflow/step_types.go - Comprehensive version with 11 fields for workflow compilation
• pkg/cli/copilot_setup.go - Simplified version with 5 fields for Copilot setup scaffolding

While these serve different purposes, the name collision creates confusion.

Implementation Steps

1. Open pkg/cli/copilot_setup.go
2. Rename type from WorkflowStep to CopilotWorkflowStep at line 42-49
3. Update all references within the same file (estimated 3-5 locations)
4. Run tests to verify: make test-unit
5. Run full validation: make agent-finish

Files to Modify

• pkg/cli/copilot_setup.go - Rename type and update references

Acceptance Criteria

• Type renamed to CopilotWorkflowStep in copilot_setup.go
• All references within the file updated
• No type name collisions remain
• All tests pass (make test-unit and make test)
• Code builds successfully (make build)

Estimated Effort

30 minutes

Priority

Low - Improves clarity but doesn't affect functionality
Related to #6836

AI generated by Plan Command for discussion #6829