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Adds the access foundation everything else enforces against. SharedKernel (shared access contracts, no Identity dependency for consumers): - ScopeRef/ScopeType, RoleType, Capability, AccessPolicy (role x capability matrix), ICurrentUser, IPermissionService (scope-chain evaluation). Identity module: - Member, Membership, Invitation entities; internal IdentityDbContext (schema "identity") + InitialIdentity migration; design-time factory. - JWT auth (HS256) issuing membership claims; PasswordHasher<Member>; CurrentUser (claims -> ICurrentUser) and PermissionService implementations. - Public IMemberDirectory contract for other modules to resolve member display info. - Endpoints: POST /bootstrap (first owner), /auth/login, GET /me, POST /invitations, POST /invitations/accept. Owner-only actions enforced via IPermissionService. - Web host wires UseAuthentication/UseAuthorization and string-enum JSON. Verified: build green; ArchitectureTests 8/8 (Identity references only SharedKernel); IntegrationTests 11/11 incl. a new end-to-end flow — bootstrap -> login -> /me -> invite -> accept -> login as invitee, and a Member is 403'd from inviting. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>