Multi-Tenancy: locations are purely per-company (correct Settings/Progress/Dev Guide)
Multi-Tenancy: add Developer Guide (make a module company-aware); assets in Progress + Settings
Teams can grant company access (additive) — staff-access + Teams docs Documented team → company access: additive grants unioned into getAccessibleTenantIds, team default = grants nothing, effective access shown on System → Analysts. Updated Multi-Tenancy-Staff-Access (new team-grant section + reframed access as analyst-and-team), System.md Teams (Manage companies), Multi-Tenancy-Progress (done), Multi-Tenancy-Settings (teams stay global but can carry client grants).
Multi-tenancy settings: per-company add/hide (types+origins) + rationale for global-only settings
Add Multi-tenancy section (9 pages: design, routing, settings, self-service, worked examples, pitfalls, scope)