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/2026-09-25.md

@@ -0,0 +1,15 @@
+# Sep 25 (Fri) — Kings Canyon
+
+**Stay:** [Gilmore Cabin — Miramonte](../bookings/stays/cabin-sequoia-miramonte.md)
+
+## Logistics
+
+- LK: away from the group; her Sep 25–27 plans are TBC (LA hotel cancelled, no car)
+
+## Plan
+
+> Menu: [`parks_sights.md`](../parks_sights.md)
+
+- **Morning** Grant Grove & General Grant Tree
+- **Midday** Kings Canyon Scenic Byway descent
+- **Afternoon** Zumwalt Meadow → Road's End