Data layer for extending shared group collections from KV to docs. KV behavior
unchanged (callers pass kind="kv").
- 0054_group_docs.sql: widen the group_collections kind CHECK to ('kv','docs')
and add the group-keyed group_docs store (clone of docs/0013, keyed by
group_id, CASCADE on group delete) + its (group_id,collection) and data GIN
indexes.
- group_collection_repo: thread a `kind` parameter through list_for_owner,
resolve_owning_group, insert/delete_collection_tx; add list_all_for_owner ->
(name,kind) for the kind-aware diff (D4). Relocate the injectable
GroupCollectionResolver trait + Postgres impl here (now shared by kv+docs;
resolve takes kind) — was in group_kv_service.
- group_docs_repo: a near-clone of docs_repo keyed by group_id; find reuses the
generalized build_find_query.
- docs_repo: generalize build_find_query(table, owner_col, owner_id, …) — both
are compile-time literals (no injection); app docs passes ("docs","app_id"),
group docs ("group_docs","group_id"). row_to_doc/build_find_query are now
pub(crate) for reuse.
Schema snapshot re-blessed (55 migrations).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
