IAV-1203/feat: add wizardCompleted state to sub-agents and enforce configuration gating

Summary

This MR introduces a new wizardCompleted flag to sub-agents in order to clearly distinguish between:

• Sub-agents that have completed the setup wizard
• Sub-agents that are still partially configured

Motivation

Previously, there was no explicit way to differentiate incomplete agents from fully configured ones. This created ambiguity and allowed access to features that require a fully configured agent.

Changes

• Added wizardCompleted property to sub-agents
• Updated logic to identify configuration state more explicitly
• Prepared feature gating based on:
  • Wizard completion
  • Workflow creation
  • Agent activation

Impact

• Enables blocking access to advanced features until configuration is complete
• Improves UX by guiding users through required setup steps
• Reduces risk of misconfigured or unusable agents

Next Steps

• Enforce UI restrictions based on full configuration state
• Add visual indicators for incomplete vs complete agents
• Integrate with workflow and activation checks

Testing

• Verified correct differentiation between wizardCompleted: true and false
• Ensured no regression in sub-agent listing and selection

Related Issues

Closes IAV-1203