Interface Milestone

Milestone - Represents a project milestone

A milestone groups multiple phases into a meaningful deliverable. Milestones track progress, completion, and archive history.

Fields:

• name: Milestone identifier (e.g., "v1.1 Full Command Implementation")
• scope: Description of what the milestone delivers
• phases: Array of phase numbers included in milestone
• theme: Optional theme/slogan for the milestone
• status: Current status (planned, in-progress, completed)
• startedAt: ISO date when first phase started (null if not started)
• completedAt: ISO date when marked complete (null if not complete)
• createdAt: ISO date when milestone was created