ESIP presentations: Metadata concatenation in virtual stores and GeoZarr

[maxrjones]

Creating a sub-issue for the two ESIP presentations that I need to complete before the conference next week:

1. Metadata considerations in building stores for https://2026julyesipmeeting.sched.com/event/2OZsM/virtual-stores-bridging-archival-formats-with-cloud-native-access-part-1
2. Status and plans for GeoZarr for https://2026julyesipmeeting.sched.com/event/2OZtu/cell-based-spatiotemporal-data-standards-where-conventions-support-where-they-diverge-and-what-to-work-on-together