Faster grep on Volumes v2 for Sandboxes

We've recently made grep faster on Volumes v2 (~10x on cold caches and ~6x on warm caches). More and more teams are using Volumes as a file system for their Sandboxes, which means a lot of code now lives in them. Agents love to grep, so we set out to make it fast.

Behind the scenes, the improvements come from changing how we prefetched metadata and content for small files. We’re continuously working on performance, so more to come here!