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Greptile Summary

This PR fixes a flaky Windows CI job (checks-windows) where a corrupted or incomplete pnpm store caused missing dependencies (@anthropic-ai/vertex-sdk, matrix-js-sdk, openai, etc.) and broke downstream test shards.

The previous fallback was a no-op — it retried the exact same command (--prefer-offline + same flags), so it would fail for the same reason. The new fallback removes node_modules and re-runs install without --prefer-offline, allowing pnpm to fetch the missing packages directly from the registry. --frozen-lockfile is correctly preserved in both attempts to maintain lockfile integrity.

Key details:

• The defaults.run.shell: bash set at the job level makes rm -rf node_modules valid on the Windows runner.
• The fallback is intentionally limited to this Windows job; Linux/macOS runners do not have this step at all (they rely on a different cache action setup).
• One minor note: if the pnpm store itself (not just node_modules) is corrupted/partially written, the fallback still queries the store first before going to the network. In practice this covers the reported "missing package" case, but a fully corrupted store might need pnpm store prune as an additional step in future.

Confidence Score: 5/5

• This PR is safe to merge — it's a targeted CI reliability fix with no impact on application code.
• The change is minimal and well-scoped: it replaces an ineffective retry (same flags, same outcome) with a meaningful fallback that clears node_modules and fetches fresh from the registry. Shell compatibility is confirmed via the job-level bash default. --frozen-lockfile is preserved in both paths, so lockfile integrity is not compromised. No application logic is touched.
• No files require special attention.

_{Reviews (1): Last reviewed commit: "fix(ci): force reinstall node_modules wh..." | Re-trigger Greptile}