Add per-leg sights menus; rename yosemite_sights to parks_sights

- Rename yosemite_sights.md -> parks_sights.md, broaden to cover both
  Yosemite and Sequoia/Kings Canyon
- Add sf_sights.md, la_sights.md, vegas_sights.md candidate menus
- Link all sights menus from README and itinerary

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

la_sights.md

@@ -0,0 +1,33 @@
+# Los Angeles — Places to See
+
+*Candidate menu of sights. No day plan yet (Sep 27–29) — pick from here to build one.*
+
+> **Getting around:** you still have the rental car through Sep 30 — essential here, LA is spread out and transit is weak. Budget for traffic between areas.
+
+## Beaches & Coast
+
+- **Santa Monica Pier** — Ferris wheel, end of Route 66
+- **Venice Beach** — boardwalk, canals
+- **Malibu** — coastline, PCH drive
+
+## Hollywood & Landmarks
+
+- **Griffith Observatory** — Hollywood Sign views, city panorama (great at sunset)
+- **Hollywood Walk of Fame** & TCL Chinese Theatre
+- **Beverly Hills / Rodeo Drive**
+
+## Museums & Culture
+
+- **Getty Center** — art + architecture + gardens, free entry (paid parking)
+- **LACMA** — Urban Light installation
+- **The Broad** — contemporary art (free, reserve ahead)
+
+## Theme parks (full-day each, optional)
+
+- **Universal Studios Hollywood**
+- **Disneyland** — Anaheim, ~45 min south
+
+## Neighborhoods
+
+- **Downtown LA** — Grand Central Market, Arts District
+- **Santa Monica / Abbot Kinney** — dining, shopping