fix(windows): repair legacy PNPM_HOME registry type

[amishabenramani]

Summary

Repair the registry type left by older Windows pnpm installations when PNPM_HOME already contains the requested path. Previously, the updater compared only the data and skipped an existing REG_EXPAND_SZ; it now also checks the type and writes REG_SZ when needed.

Refs pnpm/pnpm#5696. This fixes the shared TypeScript component used by pnpm v11. A companion change is being prepared in pnpm's Rust implementation. The component will need a release and dependency uptake before this repair reaches pnpm v11.

Behavior and scope

• Preserve the refusal to overwrite a different PNPM_HOME without force.
• Keep repeated setup idempotent once both the type and value are correct.
• Preserve Path and avoid inserting its existing entry again.
• Propagate a failed repair and restore the original code page.
• Do not claim to address the separate Windows OpenSSH environment-expansion issue.

The existing skipped-value fixture now uses REG_SZ. A separate regression suite covers the legacy type, repeated setup, both types with a conflicting path, forced overwrite, and a failed write.

Verification

Native Windows x64, Node 25.2.1, using the real checked-out source and spec files with a task-local Jest 29.7 / ts-jest runner:

• Before the fix: 2 regression failures, 15 passes; all 11 existing tests passed.
• After the fix: both suites passed, 17 tests total.
• Strict TypeScript source checking: passed.
• git diff --check: passed.

All registry and code-page commands are mocked; no persistent user environment was modified. The complete Bit workspace/CI pipeline has not been run locally. This PR remains draft pending that CI verification and companion coordination.

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Written by an agent (ChatGPT, GPT-6 Astra Pro).

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