transport: record updated SIXT agreement

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

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+# SIXT — updated rental agreement
+
+Booking `9739014160` · rental agreement `9614775261`
+
+- **From:** SIXT <rental@sixt.com>
+- **To:** donbot@sixt.spqr.link
+- **Subject:** Your updated Rental Agreement 9614775261
+- **Received:** 2026-09-20 21:19:35 UTC (2026-09-20 14:19:35 PDT)
+- **Message-ID:** `f40f5765-63ba-492c-914c-4a990946f14d@dfw1s10mta1890.xt.local`
+
+Mailbox source: normalized extraction from Fastmail; the mailbox tool did not provide the original `.eml` artifact. No links in the message were opened.
+
+## Durable facts
+
+The updated rental agreement reports:
+
+- **Parking:** SFO Rental Car Center, Level 2, Section B, spot 14 (`SFO-LV2-B-14`)
+- **License plate:** `CA-9YIK383`
+- **Fuel level:** 21.2 US gal
+- **Pickup shown on agreement:** 2026-09-20 13:50 PDT, San Francisco International Airport
+- **Return shown on agreement:** 2026-10-05 13:30 PDT, San Francisco International Airport
+- **Rental total including tax:** US$897.93
+- **Deposit hold:** US$200.00, described as released after return; not an additional expense
+
+The vehicle and plate match the current normalized booking record. A separate SIXT booking-update email received earlier on 2026-09-20 displays the pickup as 14:00 PDT; both times are preserved rather than choosing between them.
+
+The message also repeats SIXT's general advice to update the booking before an early return and to expect any final invoice after return. Those are operational instructions from the email, not actions performed by this record.