fix(process): prioritize PATHEXT extensions over extensionless files on Windows

[SpencerJung]

Description

Fixes code-yeongyu/oh-my-openagent#4262

On Windows, getWindowsPathExtensions returns an empty string at the beginning of the extensions array. This causes resolveWindowsCommand to prioritize extensionless files over .bat/.cmd wrapper scripts when resolving commands from PATH.

Changes

• Moved empty string from the start to the end of the extensions array in getWindowsPathExtensions.
• This ensures Windows PATHEXT extensions (.COM, .EXE, .BAT, .CMD) are checked first, matching cmd.exe behavior.

Verification

• Manually verified that resolveWindowsCommand now prefers .bat over extensionless files.

Checklist

• PR targets main branch
• npm run build passes
• npm test passes

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Summary by cubic

Fixes command resolution on Windows to prioritize PATHEXT extensions over extensionless files, so .bat/.cmd wrapper scripts are chosen first, matching cmd.exe behavior. Implemented by moving the empty extension to the end of getWindowsPathExtensions.

^{Written for commit a8e1480. Summary will update on new commits. Review in cubic}

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}