Implement epic and task types to replace project field

Major refactoring of task data model: - Added TaskType enum (Epic |
WorkTask) - Replaced taskProject with taskType and taskParent fields -
Epics are containers for tasks (hierarchical organization) - Tasks can
have optional parent epics - Updated createTask signature to accept
type and parent - Updated CLI: --type=epic|task and --parent=<id>
options - Updated list command to filter by type and parent - Updated
printTask to display type and parent info - Fixed naming collision
(WorkTask instead of Task constructor)

Example usage:
  task create "Auth System" --type=epic task create "Design API"
  --type=task --parent=t-abc123 task list --type=epic task list
  --parent=t-abc123

Completed task: t-8WR5Zg

Amp-Thread-ID:
https://ampcode.com/threads/T-85f4ee29-a529-4f59-ac6f-6ffec75b6a56
Co-authored-by: Amp <amp@ampcode.com>

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