- Rename response timestamps to created_at / updated_at / closed_at
- Replace is_closed bool with state ("open" / "closed") via api.StateType
- Switch template_type / card_type / type to string enums with input validation
- Embed creator User object on Project and ProjectColumn (batched lookup)
- Add absolute html_url; drop relative url
- Add POST /repos/.../projects/{id}/issues/{issue_id}/move with optional sorting
- Validate column hex color and reject writes to closed projects
- Document issue-only project scope in swagger
- Push project-issue existence check into project_model.IsIssueInColumn
- Add project_service.ErrIssueNotInProject sentinel for the move endpoint
Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>
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