feat(phase-4): SMS gateway dashboard + stats + health + retry

Backend (backend/app/routers/sms.py):
- GET /api/sms/stats: aggregate totals by status, daily volume chart
  (configurable N days), per-school top-10 breakdown, delivery rate,
  live queue depth
- POST /api/sms/jobs/{id}/retry: reset failed/cancelled job to pending
- GET /api/sms/health: Semaphore API connectivity check + credit balance
- POST /api/sms/trigger-queue: manually fire sms.process_queue Celery task

Frontend (frontend/src/pages/SmsPage.vue) — rebuilt from scratch:
- Semaphore health badge with live status indicator and balance display
- 'Process Queue' button calling POST /api/sms/trigger-queue
- KPI row: Total, Sent, Failed, Pending (queue depth), Delivery Rate %;
  period picker switching between 7/30/90 day views
- Volume bar chart: daily sent vs failed bars with hover tooltips,
  x-axis date labels, legend; no charting library required
- School breakdown panel: top 10 schools by volume with delivery
  percentage bars
- Jobs table: status + school + phone number filters; inline error
  message on failed rows; Retry button for failed/cancelled jobs;
  retry count display; pagination

api.ts: getSmsStats, retrySmsJob, getSmsHealth, triggerSmsQueue

PAUL: Phase 4 marked complete, STATE + ROADMAP updated

.paul/ROADMAP.md

@@ -19,8 +19,8 @@ SMS flow: On-prem TapTrack polls Hub every 30s → Hub queues SMS jobs → Hub s
 ## Current Milestone
 
 **v1.0 — Foundation & Core Services**
-Status: Phase 3 complete — Phase 4 next
-Phases: 3 of 15 complete
+Status: Phase 4 complete — Phase 5 next
+Phases: 4 of 15 complete
 
 ---
 
@@ -31,7 +31,7 @@ Phases: 3 of 15 complete
 | 1     | Project Setup & Infrastructure | 1   | ✅ Complete  | 2026-03-15 |
 | 2     | School Registry + License Mgmt | 2   | ✅ Complete  | 2026-03-15 |
 | 3     | On-Prem License Validation     | 1   | ✅ Complete  | 2026-03-15 |
-| 4     | SMS Gateway (credits + queue)  | TBD | Not started  | —          |
+| 4     | SMS Gateway (credits + queue)  | 2   | ✅ Complete  | 2026-03-15 |
 | 5     | On-Prem SMS Polling Agent      | TBD | Not started  | —          |
 | 6     | Super Admin Dashboard UI       | TBD | Not started  | —          |
 | 7     | School Admin Portal UI         | TBD | Not started  | —          |

.paul/STATE.md

@@ -3,10 +3,10 @@
 ## Current Position
 
 Milestone: v1.0 — Foundation & Core Services
-Phase: 3 of 15 (On-Prem License Validation — complete)
-Plan: Phase 3 complete — Phase 4 next
-Status: **Phase 3 applied — ready to begin Phase 4**
-Last activity: 2026-03-15 — Phase 3 complete (TapTrack on-prem: license validation task, startup check, hub router, frontend warning banner)
+Phase: 4 of 15 (SMS Gateway — complete)
+Plan: Phase 4 complete — Phase 5 next
+Status: **Phase 4 applied — ready to begin Phase 5**
+Last activity: 2026-03-15 — Phase 4 complete (SMS stats/health/retry/trigger endpoints + full SmsPage dashboard with chart, KPIs, school breakdown)
 
 ## Loop Position
 
@@ -22,7 +22,7 @@ PLAN ──▶ APPLY ──▶ UNIFY
 - Phase 1  (Project Setup & Infrastructure): [██████████] 100% ✓
 - Phase 2  (School Registry + License Mgmt): [██████████] 100% ✓
 - Phase 3  (On-Prem License Validation):     [██████████] 100% ✓
-- Phase 4  (SMS Gateway):                    [░░░░░░░░░░]   0%
+- Phase 4  (SMS Gateway):                    [██████████] 100% ✓
 - Phase 5  (On-Prem SMS Polling Agent):      [░░░░░░░░░░]   0%
 - Phase 6  (Super Admin Dashboard UI):       [░░░░░░░░░░]   0%
 - Phase 7  (School Admin Portal UI):         [░░░░░░░░░░]   0%
@@ -37,8 +37,8 @@ PLAN ──▶ APPLY ──▶ UNIFY
 
 ## Next Action
 
-Run: `/paul:plan` for Phase 4 — SMS Gateway (credits + queue)
-Resume file: .paul/ROADMAP.md → Phase 4
+Run: `/paul:plan` for Phase 5 — On-Prem SMS Polling Agent
+Resume file: .paul/ROADMAP.md → Phase 5
 
 ## Repo
 

.paul/phases/04-sms-gateway/README.md

@@ -1,9 +1,25 @@
 # Phase 04: SMS Gateway (Credits + Queue)
 
-**Status:** Not started
+**Status:** ✅ Complete — 2026-03-15
 
 ## Goal
 Schools submit SMS jobs via Hub; Hub sends via Semaphore; credits deducted per message.
+Full SMS dashboard for super admin with stats, charts, job table, Semaphore health.
 
-## Plans
-- [ ] TBD — run /paul:plan when Phase 3 is complete
+## Completed
+
+### 4-01: Backend stats + retry + health + trigger
+- `GET /api/sms/stats` — aggregate totals, daily chart (N days), school breakdown
+- `POST /api/sms/jobs/{id}/retry` — reset failed/cancelled job to pending
+- `GET /api/sms/health` — Semaphore connectivity + credit balance
+- `POST /api/sms/trigger-queue` — manual Celery task trigger (admin)
+- `api.ts`: getSmsStats, retrySmsJob, getSmsHealth, triggerSmsQueue
+
+### 4-02: SmsPage full dashboard
+- Semaphore health badge (green/red, shows balance)
+- Process Queue button (fires trigger-queue)
+- KPI row: Total, Sent, Failed, Pending, Delivery Rate %, period picker 7/30/90d
+- Volume bar chart (daily sent vs failed, hover tooltips)
+- School breakdown panel (top 10, sent/total ratio bars)
+- Jobs table: status + school + phone filters, error message on failed rows,
+  Retry button, retry count, pagination