Read side of §7 ownership, ahead of the claim logic.
- project_repo: `ProjectRepository` trait + `PostgresProjectRepository`
(list / get_by_id / get_by_slug). Writes are NOT here — a claim registers
its project via an in-tx upsert (next commit).
- group_repo: `list_with_owner()` LEFT-JOINs projects for each group's owner
slug (backs `pic groups ls`); columns qualified since id/slug/name exist on
both tables.
- ApplyService gains a `projects` handle; constructed in the picloud binary.
- tests/projects_repo: round-trip pinning list_with_owner (claimed→slug,
unclaimed→None) and that ancestors() surfaces owner_project nearest-first —
the fold input the claim path walks.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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