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Greptile Summary

Fixed Windows-specific bug where PATH environment variable prepending would create a duplicate uppercase PATH key instead of updating the existing mixed-case Path key.

• Added findPathKey() helper to locate PATH key case-insensitively in env objects
• Updated applyPathPrepend() and applyShellPath() to preserve original PATH key casing
• Added comprehensive tests covering Windows-style Path key handling and edge cases

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The fix is targeted and well-tested, addressing a specific Windows PATH casing issue. The implementation is backward compatible, adds proper case-insensitive lookup, and includes comprehensive test coverage that verifies the fix works correctly while preventing regressions.
• No files require special attention

_{Last reviewed commit: a2ea6bc}

Thanks again for the original patch and investigation here.

I’m closing this PR as superseded by #31879, which carries the same fix and was merged after this PR became blocked by a persistent GitHub head-ref sync issue.

Credit for the original fix remains with @Glucksberg.