Fix: Always create initial task for new Code Conductor projects

[ryanmac]

Summary

• Fixed issue where new/empty projects would not receive an initial task during setup
• Added separate task template for new projects focused on planning and initial setup
• Ensures all users have clear next steps after installing Code Conductor

Problem

When installing Code Conductor in a new project, users would see "No tasks found" with no clear guidance on what to do next. The setup process only created discovery tasks for existing projects with substantial content.

Solution

Modified DiscoveryTaskCreator to:

1. Always create an initial task regardless of project state
2. Use different task templates based on project type:
   • Existing projects: Discovery task to map documentation and create tasks
   • New projects: Planning task to define project structure and create initial tasks

Test plan

• Code passes flake8 linting
• Code passes black formatting
• CI checks pass
• Manual testing shows initial task created for both new and existing projects

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