fix: update Day 1 schedule to replace Community Driven Discussion with new sessions

Signed-off-by: Alex Lovell-Troy <alex@lovelltroy.org>

Author: alexlovelltroy

content/events/Summits/2026/UCL26/schedule.md

@@ -57,7 +57,9 @@ contributors = ["Alex Lovell-Troy",]
 | 12:20–13:20 | Lunch | — |
 | 13:20–13:40 | Community Delevelopment and Discussion | Alex Lovell-Troy |
 | 13:40–14:00 | OpenCHAMI with Talos | Tiziano Mueller |
-| 14:00–15:20 | Community Driven Discussion | Host: Alex Lovell-Troy |
+| 14:00–14:30 | OpenCHAMI for AI Systems: Reflections on the first year| Alex Lovell-Troy |
+| 14:30-14:45 | Image Builder: How LANL builds and manages images | Alex Lovell-Troy |
+| 14:45-15:00 | Lightning Talks | Alex Lovell-Troy |
 | 15:20–15:40 | Afternoon Break | — |
 | 15:40–16:20 | Project Review: Current Developments from LANL Needs | Alex Lovell-Troy |
 | 16:20–16:40 | Open Discussion: Priorities and Risks for 2026 | Alex Lovell-Troy and Hosts |