backend phase 2: identity — phone-OTP auth, sessions & roles (REST)

- six REST endpoints (auth/request_otp, verify_otp, refresh, logout, me,
  me/select_role) wrapping the existing JWE/TOTP/RBAC engine
- usr.UserSessions with refresh-token rotation + stolen-token (replay)
  detection → revoke-all + 401; logout rotates the security stamp
- users extended: gender, national_id (enc, NULL until KYC),
  shahkar_verified_at (auto-reset on phone change), phone_hash UNIQUE,
  is_active, deleted_at + soft-delete filter; phone/email/national_id
  encrypted at rest via IFieldEncryptor value converter
- user_roles grant/revoke audit trail + global revoked filter; 7 roles
  seeded; admin sub-roles never self-assignable (403)
- ISmsSender seam (mock logs the OTP code) replaces the TODO log lines
- OperationResult/BaseController learned enveloped 401/403
- auth knobs as platform_configs rows (resend/attempts/session TTL)
- migration IdentitySessionsAndUserExtensions applied to the dev DB
- 24 new tests incl. Baya.Test.Api (WebApplicationFactory over SQLite);
  47 total green, zero new build warnings; swagger snapshot + contract
  (identity-auth.md), handoff, report, mocks-registry updated

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

dev/shared-working-context/backend/STATUS.md

@@ -12,6 +12,27 @@ One block per completed backend phase. Newest at the top. Backend lane writes he
 - **Notes for frontend:** <anything load-bearing>
 -->
 
+## backend-phase-2 — Identity: phone-OTP auth, sessions & roles (REST) — 2026-07-02
+- **Shipped:** the six-endpoint REST auth surface (`auth/request_otp`, `auth/verify_otp`,
+  `auth/refresh`, `auth/logout`, `me`, `me/select_role`) wrapping the existing JWE/TOTP/RBAC engine;
+  new `usr.UserSessions` (refresh-token rotation + revoke-all on replayed token); `usr.Users` extended
+  (`Gender`, `NationalId` enc NULL, `ShahkarVerifiedAt` auto-reset on phone change, `PhoneHash`
+  UNIQUE, `IsActive`, `DeletedAt` + soft-delete filter); phone/email/national-id **encrypted at rest**
+  (EF value converter over `IFieldEncryptor`); `usr.UserRoles` grant/revoke audit trail + revoked
+  filter; 7 roles seeded; `ISmsSender` seam (mock logs the code); 3 auth config keys;
+  `OperationResult`/`BaseController` learned 401/403.
+- **Contracts:** dev/contracts/domains/identity-auth.md + openapi snapshot refreshed (yes — 22 paths).
+- **Mocked:** `ISmsSender` → 🟡 (see reports/mocks-registry.md).
+- **Gate:** build clean (0 new code warnings) / tests green (47 pass: 10 new `Baya.Test.Api`
+  integration + 14 new handler unit tests). Migration `IdentitySessionsAndUserExtensions` applied to
+  the dev DB; full §7 flow verified live (OTP in log, tokens, 401/403/429, rotation, replay-revoke,
+  logout stamp-kill).
+- **Handoff:** backend/handoff/after-backend-phase-2.md
+- **Notes for frontend:** exact paths are `request_otp`/`verify_otp`/`select_role` (snake_case
+  transformer — not the `otp/request` sketch). Bodies camelCase. Fresh users: `roles: []` → role
+  router → `me/select_role` → **refresh tokens** to pick up role claims. `/me` phone is masked.
+  SMS is mocked — read the OTP from the server log.
+
 ## backend-phase-1 — Config, reference & platform signals — 2026-07-02
 - **Shipped:** first marketplace migration baseline (`InitialMarketplaceBaseline`, new **`ops`** schema)
   with 6 tables (`PlatformConfigs`, `AuditLogs`, `SystemEvents`, `IranianHolidays`, `Notifications`,