ArtifactFuse is the FUSE adapter following the tigrisfs GoofysFuse pattern: embed NotImplementedFileSystem + core state, thin operation wrappers.

BaseNode represents a tracked entry from the git tree. Inode IDs are assigned at runtime by the FUSE layer (monotonic allocation, like tigrisfs).

MountedFS matches tigrisfs's interface for mount lifecycle.

OnHydratedFunc is called after a blob is successfully fetched. Allows the caller to update metadata (e.g., backfill file sizes in the snapshot).

ReaddirEntry holds child metadata, avoiding per-child Getattr or snapshot lookups.

batchCatFile manages a persistent `git cat-file --batch` process. The persistent process amortizes process startup and (on blobless clones) remote con

batchPool maintains a pool of reusable cat-file --batch processes so multiple hydrator workers can fetch blobs concurrently.

fakeOverlay satisfies model.OverlayStore for testing.

--- Mount lifecycle ---

timing records a labeled duration.