New external role administrator_viewer: signs into the admin interface and reads everything for its granted funds and SPVs (overview, partners, capital accounts with every investor's statements, documents, valuation history) but every write is refused: no imports, uploads, deletions, entity edits, exit marking, or account management. No migration needed; roles are stored as strings. Internal admins can flip an Administrator between full management and view only via a new Access level dropdown in Users > Manage. The user-list endpoint is read-widened for the viewer role so investor names resolve on its screens; all mutating endpoints keep the stricter gate.
StartOS packaging
StartOS 0.4.0 service packaging goes here (Issue 17).