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/2026-09-24.md

@@ -0,0 +1,14 @@
+# Sep 24 (Thu) — Yosemite → Sequoia
+
+**Stay:** [Gilmore Cabin — Miramonte](../bookings/stays/cabin-sequoia-miramonte.md) · check-in from 4 PM
+
+## Logistics
+
+- Check out of Wawona by 10 AM · Hwy 41 south, ~3 hrs
+
+## Plan
+
+> Menu: [`parks_sights.md`](../parks_sights.md)
+
+- **Afternoon** Giant Forest Museum → General Sherman Tree (shuttle) → Congress Trail (2-mile paved loop)
+- **Late afternoon** Moro Rock