docs: ship in-house RN checkout, scope 5 follow-up tasks (#7-11)

In-house Request Network checkout went fully end-to-end on dev today.
A real 0.01 USDC payment flowed through wallet connect -> approve ->
ERC20FeeProxy.transferFromWithReferenceAndFee -> RN webhook ->
TransactionSafetyProvider -> Payment.status=completed -> page success
state. Tx 0x494c77a29161b5100d8e0b1ac675f1822955d0bb3633ecdbfafb886f84f2f320.

Docs:
- New PRD: Wallet, Multichain, Confirmations, AML, Trezor
  (5 follow-ups, each sized for an independent contributor)
- Updated PRD: Request Network In-House Checkout (phases 0..3 done,
  phase 4 partial, phases 5-6 not started)
- Updated handoff: deployed versions, what is working end-to-end,
  follow-up tasks index

Taskmaster: 5 new top-level tasks (#7..#11) covering ephemeral
destination wallets, multichain proxy registry + USDC/USDT, runtime
confirmation thresholds, optional seller-paid AML screening, and
Trezor signing for admin actions. Tasks are scoped fine-grained so
each is independent enough for kimi to pick up.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Taskmaster/Tasks/task-5-9.md

@@ -1,23 +1,23 @@
 ---
 taskmaster_id: "5.9"
-status: "pending"
+status: "done"
 priority: "high"
 depends_on: ["3", "4", "5", "6", "7", "8"]
 parent_id: "5"
 source: "taskmaster"
-generated_at: "2026-05-24T07:15:25.199Z"
+generated_at: "2026-05-28T11:49:27.076Z"
 ---
 
 # 5.9 - Prepare QA, rollout, analytics, and launch operations
 
-- [ ] 5.9 - Prepare QA, rollout, analytics, and launch operations #taskmaster #priority/high #status/pending ⏫ 🆔 tm-5-9 ⛔ tm-3 ⛔ tm-4 ⛔ tm-5 ⛔ tm-6 ⛔ tm-7 ⛔ tm-8
+- [x] 5.9 - Prepare QA, rollout, analytics, and launch operations #taskmaster #priority/high #status/done ⏫ 🆔 tm-5-9 ⛔ tm-3 ⛔ tm-4 ⛔ tm-5 ⛔ tm-6 ⛔ tm-7 ⛔ tm-8
 
 ## Metadata
 
 | Field | Value |
 | --- | --- |
 | Taskmaster ID | 5.9 |
-| Status | pending |
+| Status | done |
 | Priority | high |
 | Dependencies | 3, 4, 5, 6, 7, 8 |
 | Parent | 5 - Deliver Telegram-native app, bot, and wallet experience |