Chris Hendrickson
f89b3aa998
Add milestones and labels to Ticket model (DEW-0011)
- Ticket.milestones and Ticket.labels: List<String>, optional (default [])
- toFileContent() emits milestones:/labels: YAML lists when non-empty
- fromFileContent() parses them back; empty when absent (backwards compat)
- TicketStore.create() and update() accept milestones/labels params
- CreateCommand and UpdateCommand: --milestone/--label multi-options
- ListCommand and SearchCommand: --milestone/--label filter options
- 4 new tests: model roundtrip, store persistence, update patch, no fields when empty
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>