.plan-26-31: Sorting out Tessera and Evidence TAP infrastructure

I had a bunch of infrastructure work I had to get done this week, and so I went headsdown hacking to sort out both TESSERA and the Evidence TAP this week! I spent it moving a petabyte of TESSERA embeddings onto Source Cooperative, taking a detour to investigate Icechunk before settling on transcoding to Zarr on AWS Fargate Spot.