Add customer-supplied parts clause to repair agreement

Legal/Standard_Repair_Agreement.md

@@ -60,6 +60,17 @@ By submitting a device for repair, you authorize digiBandit to:
 - Issues unrelated to the original repair
 - Devices repaired elsewhere after our service
 - Software issues (unless part of original repair)
+- Parts supplied by the customer (see below)
+
+## Customer-Supplied Parts
+
+If a required part is not available from our North American suppliers, we will provide you with a link to source it yourself. In this case:
+
+- You take your device home and order the part independently
+- When the part arrives, bring both the device and the part back to us
+- We will complete the repair at our standard labor rate
+- **No warranty is provided on customer-supplied parts** — we warranty our labor only
+- This will be noted on your invoice
 
 ## Data & Privacy