Change default ticket status from backlog to draft

Tinker

Home Epics Change default ticket status from backlog to draftEdit

Cancel

Title *

Project *

Description

Currently, newly created tickets fall into `backlog` status by default. Change this so that new tickets start in `draft` status instead.

This better separates "just created, not yet planned" tickets from "planned but not started" tickets.

## Scope

### Database/Model
- Update Ticket model to default new records to `draft` status
- Migration to set any `nil` status tickets to `draft` (data cleanup)

### Behavior Change
- `Ticket.create`, `Ticket.new` without explicit status → `draft`
- MCP `create_ticket` tool → new tickets start as `draft`
- Any other ticket creation paths → ensure `draft` default

### Why Draft First?
- **Draft**: Ticket exists but not yet planned/estimated (like a stub)
- **Backlog**: Planned, prioritized, ready to claim
- This separation helps with workflow clarity

## Acceptance Criteria
- [ ] New tickets default to `draft` status instead of `backlog`
- [ ] Existing database records with nil status are set to `draft`
- [ ] Tests verify new tickets start in draft state