Windows remembers its git launcher check between runs

On Windows, git is sometimes started through a launcher program rather than directly. Claude Code checks that launcher to find the real git. It used to run this check every time it started. It now saves the answer, tied to the launcher file's size and last-modified time, and reuses it as long as those stay the same. It still confirms that the result is git.exe and that the git version is at least 2.26.