Phase 8 of multi-repository task support: surface duplicate-repository
input as a clean validation error instead of letting the unique
(task_id, repository_id) constraint surface mid-loop with some rows
already inserted.
- createTaskRepositories tracks seen repository IDs and returns
"repository <id> listed more than once for the task" before any
CreateTaskRepository call.
- Tests cover the rejection path and confirm two distinct repos still
succeed with both rows persisted in Position order.
Repository discovery and per-repo cloning were already covered by
Phase 1.4 (resolveAllRepoInfo loops ensureRepoCloned) and the
existing repository_discovery service is repo-list aware by design.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Kandev Agent
bce06b1af3