Add Lambda prize payout workflow

.github/ISSUE_TEMPLATE/lambda-prize-claim.yml

@@ -9,9 +9,14 @@ body:
       value: |
         If you have been awarded a Lambda Prize, please complete this form with your data first:
 
-        **https://TBD.typeform.com/to/TBD**
+        **https://34z6hn3eyj7.typeform.com/to/xtlTNs82**
 
-        After submitting, open this issue and paste your **Typeform response ID** in the field below. We use it to match your answers to this ticket. If everything checks out, we will proceed with payment.
+        In the form, you will be provided with a **Typeform response ID**. Please save/copy it.
+
+        After submitting the form, open this issue (via this template) and complete the fields below. We use your **Typeform response ID** to match your Typeform answers to this ticket. Your **Ethereum wallet address** will appear on this **public** issue; if privacy is a concern, use a **single-use** address.
+
+        > [!IMPORTANT]
+        > The prize amount will be paid in **USDT on Ethereum** to the **Ethereum wallet address** you enter below.
 
   - type: input
     id: typeform_response_id
@@ -21,3 +26,12 @@ body:
       placeholder: e.g. abc123…
     validations:
       required: true
+
+  - type: input
+    id: ethereum_wallet_address
+    attributes:
+      label: Ethereum wallet address
+      description: Must match the Ethereum address you entered in Typeform. This is the address that will receive the USDT payout.
+      placeholder: "0x…"
+    validations:
+      required: true

README.md

@@ -79,6 +79,20 @@ The following policies apply to **all** prizes unless a specific prize states ot
 
 **Demo requirements.** Every submission that requires a demo must include a narrated video walkthrough in which the builder explains what they built and why, walks through the architecture and key implementation decisions, and demonstrates the full end-to-end flow. A silent screencast without explanation is not sufficient. Prize-specific demo content is listed in each prize's **Submission Requirements**.
 
+## Claiming payment
+
+Prize payouts are handled after a winning solution is accepted and **merged**. Do not open a payment claim until your solution pull request has been merged into `solutions/` of this repository.
+
+**Flow overview**
+
+1. Your winning solution is merged.
+2. You submit the payment claim through GitHub using the **[Lambda Prize payment issue template](.github/ISSUE_TEMPLATE/lambda-prize-claim.yml)**. That template links to the claim workflow and tells you what to provide.
+3. The team verifies your claim and processes payment (prizes are paid in **USDT** on Ethereum).
+
+To complete payment, we need your **full legal name**, **country of residence**, and an **Ethereum wallet address**. Your **full legal name** and **country of residence** are required to process the payout and are **not shared with third parties**. Your **Ethereum wallet address** will be **included in your public payment claim** (the GitHub issue), so anyone can see it.
+
+If **privacy** is a concern, we recommend using a **single-use Ethereum address** for this payout.
+
 ## Terms & Conditions
 
 All participants are bound by the [Terms & Conditions](TERMS.md). Key points: