The Owner-only scope-role grant surface (Part E S4 / Part C.2). An Owner
grants {owner, contributor} at a scope their reach covers — the project or
one collection within it — to an existing account looked up by email; the
grant writes a `memberships` row immediately and §15-notifies the grantee
(direct grant, no accept round-trip — the C.2 scenarios name existing
accounts and write the row directly).
- auth.can_invite_at_project / can_invite_at_collection — the Owner-reach
invite gates (is_project_superuser / is_collection_superuser).
- memberships.py — grant (with the C.2.6 broader-supersedes-narrower prune,
preserving a stronger child grant — no negative override), revoke, list,
user_by_email.
- api_memberships.py — GET/POST/DELETE /api/projects/:id/members, the single
POST keying on optional collection_id so the invite UI's one control maps
to one endpoint; reach bounded by the inviter's Owner reach (C.2.3);
contributors refused (C.2.4); a pending grantee's row is recorded but
confers no write (C.2.7, the §6 floor).
- notify.notify_scope_role_granted + render_summary — the §15 personal-direct
notification naming the project and role.
- api_collections — surface viewer capabilities (can_create_collection,
can_invite, can_contribute, role) on the project/collection GETs to drive
the C.3 role-aware empty states.
Acceptance: test_s4_invitations_vertical.py covers C.2.1–C.2.7 over the HTTP
surface + resolver, plus the C.3 (@S4) capability flags. Full suite green
(504 passed).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Ben Stull