docs: sync from backend cdc8df1 + frontend a5dd48e + scanner 8fee27e — AMN Pay Scanner

- Activity Log: new entry for AMN Pay Scanner implementation
- Environment Variables: document AMN_SCANNER_URL, AMN_SCANNER_WEBHOOK_SECRET, AMN_SCANNER_DEFAULT
- PRD status table: mark all components implemented

09 - Audits/Activity Log.md

@@ -11,6 +11,19 @@ entries on top. Maintained by agents per the rule in `../AGENTS.md`.
 
 ---
 
+### 2026-05-29 — backend@cdc8df1 — AMN Pay Scanner integration (retire Request Network)
+
+**Commits:** backend `cdc8df1`, scanner `8fee27e`
+**Touched:**
+- Backend: `src/services/payment/adapters/amnPayAdapter.ts`, `src/routes/amnScannerWebhookRoutes.ts`, `src/services/payment/adapters/types.ts`, `src/services/payment/providerConfig.ts`, `src/app.ts`, `.env.example`, `docker-compose.dev.yml`, `docker-compose.production.yml`
+- Scanner (new repo): `scanner/*.go`, `Dockerfile`, `supported-chains.json`
+- Frontend: `src/actions/network-registry.ts`, `src/sections/admin/networks/networks-list-view.tsx`
+**Why:** Implement AMN Pay Scanner per `PRD - Retire Request Network — In-House Payment Scanner.md`. Standalone Go microservice scans `ERC20FeeProxy` `TransferWithReferenceAndFee` events directly, eliminating RN API dependency. Supports any destination address (derived HD wallets enabled). Parallel run: RN stays active for existing payments; new payments route to scanner when `AMN_SCANNER_URL` is configured.
+**Verification:** `tsc --noEmit` clean. Scanner binary builds (`go build`). Go tests pass (3/3). Frontend networks page renders scanner lag column.
+**Linked docs updated:** [[07 - Development/Environment Variables]], [[PRD - Retire Request Network — In-House Payment Scanner]]
+
+---
+
 ### 2026-05-29 — backend@7688f57 — Sweep gas strategy: PermitPull + GasTopUp signers
 
 **Commits:** backend `7688f57`