Background

Install::run in crates/package-manager/src/install.rs emits pnpm:stage events with a prefix field. Upstream pnpm sets this to lockfileDir — the directory containing pnpm-lock.yaml, which for a workspace install equals the workspace root.

Pacquet has no workspace support yet, so the current code uses manifest.path().parent() as a stand-in. This is correct for single-package installs but will be wrong once workspace installs land.

Ask

When workspace support lands, replace the manifest-parent fallback with a resolved workspace dir. The upstream helper to mirror is findWorkspaceDir, which walks up from the cwd looking for pnpm-workspace.yaml:

• https://github.com/pnpm/pnpm/blob/3b12eb27de/workspace/root-finder/src/index.ts

Per-importer stage events should each carry the importer's own prefix so the JS reporter can attribute progress correctly.

Acceptance

• findWorkspaceDir-equivalent helper exists and is used by Install::run.
• prefix matches pnpm for both single-package and workspace installs.
• Test coverage for both shapes.