- Detection now recognized `.jj/repo` as workspace metadata whether it is a directory or a file.
- Repository resolution followed `.jj/repo` file indirection so non-default `jj workspace add` workspaces resolved their shared store path.
- Tests were added to confirm `jj.repo.is` and `jj.repo.resolve` handle file-backed `.jj/repo` workspaces correctly.
- Grouped `isRepository`, `workspaceRoot`, and `clearWorkspaceRootCache` under a `repo` namespace (`repo.is`, `repo.root`, `repo.clearRootCache`).
- Promoted `diff` to a named export with a `changedFiles` sub-method via `Object.assign`.
- Added `ensureAvailable` check and `nameOnly` support to `diff`.
- Updated callers and tests to use the new API surface.
- Replaced `jj workspace root` subprocess call with a local `.jj/repo/store` directory traversal, eliminating process spawning overhead.
- Added LRU cache for resolved workspace roots to avoid redundant filesystem walks.
- Renamed internal `runCommand` helpers to `git`/`jj` for clarity.
- Replaced git subprocess setup in review test with mocked `git.status` and `git.diff` calls.
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