Phase 0 of multi-repository task support: introduces the per-repository
child table and model alongside legacy single-repo fields (dual-write,
no behavior change). Lays the foundation for the orchestrator/lifecycle
refactor in subsequent phases.
- New task_environment_repos table with FK CASCADE on task_environments.
- New task_dir_name column on task_environments (idempotent ALTER).
- TaskEnvironmentRepo model + Repos slice + RepoFor helper on TaskEnvironment.
- CRUD methods + interface extension; env getters preload Repos.
- Idempotent backfill from legacy single-repo task_environments rows.
- Tests cover round-trip, CRUD, preload ordering, embedded create, cascade
delete, and backfill from a legacy-shaped row.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Kandev Agent
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