docs: AML scope note, human-blocked items, Task #11 pre-flight inventory

- Add AML scope note to Handoff - RN Multichain Probe (sanctions-only vs full KYT)
- Add human-blocked section with 3 precise next steps for owner
- Create Task 11 Pre-flight Inventory: library choice, dev/prod flow, admin UI gaps, backend gaps, risks, acceptance criteria

01 - Architecture/System Architecture.md

@@ -205,4 +205,4 @@ See [[PRD - Request Network In-House Checkout]] and [[Request Network Integratio
 - [[Real-time Layer]] — Socket.IO setup, rooms, events
 - [[Security Architecture]] — auth, hashing, rate-limit, webhook HMAC
 - [[Tech Stack]] — exact versions & purpose of every dependency
-- [[Payment Flow - SHKeeper]] — end-to-end crypto pay-in flow
+- [[Escrow Flow]] — current Request Network pay-in, ledger, and custody release flow