itinerary: split day plans into days/, plan SF Sep 21

- One file per day under days/; timeline table reduced to date, weekday, place
- Sep 19–20: KT & VT Uber to Airbnb, rest day; LK & MS drive rental to Airbnb
- Sep 21: Silicon Valley morning, optional Twin Peaks / Painted Ladies /
  Lands End, Battery Spencer at sunset
- LK Hertz LAX rental marked not available for planning; LA / San Diego
  hotels cancelled
- sf_sights: add Silicon Valley and Mission / Castro, skip Computer History
  Museum

Claude-Session: https://claude.ai/code/session_01CWLR7htYGAB9i89P8jCCLn

days/2026-10-04.md

@@ -0,0 +1,6 @@
+# Oct 4 (Sun) — San Francisco — MS departs
+
+## Logistics
+
+- Return [SIXT rental](../bookings/transport/car-rental.md) early at SFO ~4:30 PM (booked through Oct 5, 1 PM — update return time in the SIXT account first)
+- UA8073 / AC573 SFO → YVR **7:30 PM** ([flights](../bookings/transport/flights-ms.md)) · Air Canada check-in · return bag fee at check-in