Phase 6 (subset) of multi-repository task support. The kanban now
exposes the per-task repository list to the UI and renders a compact
"+N" badge on cards whose tasks span more than one repository.
- KanbanState.tasks[].repositories slim shape (id, repository_id,
base_branch, checkout_branch, position).
- SSR mapper hydrates the full list and uses primaryTaskRepository()
to pick the position-aware primary instead of [0].
- useKanbanData passes repositories through to the card props.
- KanbanCard renders the primary repo name with a small "+N" chip
when len(repositories) > 1; tooltip names the count.
- useTaskRepositories / useTaskPrimaryRepository hooks return the
slim KanbanTaskRepository shape so multi-repo consumers share one
read path.
Larger UI surfaces (task-create dialog, diff view, file browser,
mobile sheets) still target the primary repo only — they will be
ported as the multi-repo task creation flow lands. No visible change
for single-repo tasks.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Kandev Agent
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