Implements the model-B2 membership authority (ratified compliance auth design) and inbound token verification.
- GET /v1/users/{id}/memberships: Keycloak supplies user->tenant links + org_roles (attribute projection until the realm migrates to Organizations); registered tenants override status/plan/products from registry tables (source: registry|keycloak). Closes the M5.2-deferred org_roles stub.
- New internal/authn: OIDC discovery + JWKS verification (go-oidc/v3), audience tenant-registry. /healthz + /readyz stay PUBLIC_EXPLICIT; all other routes INTERNAL_SERVICE_ONLY. AUTH_ENABLED=true refuses to start on incomplete config (fail-closed); false (dev default) keeps current behavior.
- Full suite green incl. postgres testcontainers; openapi.yaml updated (contract test passes).
Activation is a separate step (Auth-5): requires the orca-infra env merge and a portal service token (portal currently calls with no auth).
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Co-authored-by: Sharang Parnerkar <30073382+mighty840@users.noreply.github.com>
Reviewed-on: #14
internal/keycloak Adapter (HTTPAdapter + Mock). POST /v1/tenants now provisions a KC organization + IT_ADMIN invite when admin_email is set; KC failures emit keycloak.provision_failed but don't roll back. POST /v1/internal/keycloak/claims resolves the current claim bundle for any (tenant_id|tenant_slug|user_attrs.*) lookup. Mock used in tests + when KEYCLOAK_ADMIN_URL is empty. HTTPAdapter tested against an in-process stub KC (httptest.Server).
Refs: M4.3
Full M4.2 deliverable: 16 endpoints (tenants CRUD + lifecycle, catalog, entitlements, API keys with argon2 hashing, audit append + filter), Store interface with pgx-backed Postgres + in-memory parallel implementations exercised by the same eachStore harness, openapi.yaml at 3.1 with kin-openapi contract test. M4.3 adds auth.
Refs: M4.2