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/2026-09-22.md

@@ -0,0 +1,16 @@
+# Sep 22 (Tue) — San Francisco → Yosemite
+
+**Stay:** [Cabin — Wawona](../bookings/stays/cabin-yosemite-wawona.md) · check-in 4:00–11:30 PM
+
+## Logistics
+
+- LK flies to Kansas City (flight details TBC); away from the group until Sep 27
+- Check out of the Airbnb by 11 AM · depart ~7 AM
+
+## Plan
+
+> Menu: [`parks_sights.md`](../parks_sights.md)
+
+- **Morning** Tunnel View (Hwy 120 entrance) → Bridalveil Fall (5-min walk) → Valley View
+- **Late afternoon** Cook's Meadow Loop — 1 mile, flat, Half Dome framing, golden hour
+- **Evening** Wawona check-in