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

sf_sights.md

@@ -1,12 +1,12 @@
 # San Francisco — Places to See
 
-*Candidate menu of sights. The chosen, day-by-day version lives in the SF day plans (Sep 20–21) in [`itinerary.md`](itinerary.md).*
+*Candidate menu of sights. The chosen, day-by-day version lives in [`days/`](days/) (Sep 20–21).*
 
 > **Getting around:** car for the Marin side (no transit there); BART + cable cars / F-line streetcar for the downtown core (parking is brutal). Base is Daly City, ~20–30 min south.
 
 ## Marin side (car only)
 
-- **Marin Headlands / Battery Spencer** — the classic Golden Gate Bridge panorama; go early before fog
+- **Marin Headlands / Battery Spencer** — the classic Golden Gate Bridge panorama; best at sunset, stay for blue hour. Tiny lot
 
 ## North Waterfront
 
@@ -19,7 +19,7 @@
 
 ## Downtown / Central
 
-- **Ferry Building** — marketplace, food (big farmers market Tue/Sat)
+- **Ferry Building** — marketplace, food. *Farmers market Tue/Sat — misses our Sun/Mon*
 - **Cable cars** — California St or Powell lines
 - **Union Square** — shopping core
 - **Chinatown** — Dragon Gate, largest outside Asia
@@ -32,3 +32,15 @@
 - **Lands End** — coastal trail, Sutro Baths ruins
 - **Twin Peaks** — panoramic city viewpoint
 - **Ocean Beach** — Pacific coast, sunsets
+
+## Silicon Valley (car, ~45 min south)
+
+- **Apple Park Visitor Center** — Cupertino; rooftop view of the ring, AR model, store. Campus itself is closed to the public
+- **Google Visitor Experience** — Mountain View; store, café, Android statues
+- ~~**Computer History Museum**~~ — Mountain View; closed Mon–Tue, doesn't fit our car day. ❌ Skipped
+- **Stanford campus** — Palo Alto; Hoover Tower view
+
+## Mission / Castro
+
+- **Mission District** — murals (Clarion Alley, Balmy Alley), Dolores Park, best burritos in the city
+- **Castro** — historic gay neighbourhood, Castro Theatre