transport: record SIXT license verification

sources/transport/2026-09-20_SIXT_Checkin_Status.md

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+# SIXT — pre-pickup check-in status
+
+Booking `9739014160` · San Francisco International Airport
+
+- **From:** SIXT <booking@sixt.com>
+- **To:** donbot@sixt.spqr.link
+- **Subject:** You're verified! Vehicle selection opens 1 hour before pickup
+- **Received:** 2026-09-20 06:26:19 UTC (2026-09-19 23:26:19 PDT)
+- **Message-ID:** `0a8482ae-5968-474d-93ad-864f191c6afe@dfw1s10mta1887.xt.local`
+
+Mailbox source: extracted text from Fastmail; original `.eml` was not available from the mailbox tool.
+
+SIXT confirms that the renter's driver's license is verified. Vehicle selection opens one hour before pickup. The booking details shown in the message are:
+
+- Pickup: 2026-09-20 13:00 PDT, San Francisco International Airport
+- Return: 2026-10-05 13:00 PDT, San Francisco International Airport
+
+The vehicle has not been selected in this message; no change to the booked vehicle, price, payment, or planned early return is recorded.