fix(windows): detect per-user Git for Windows bash under %LocalAppData%\Programs\Git (#3738)

find_bash() rejected the WindowsApps WSL stub and then probed only %LocalAppData%\Git, so per-user Git for Windows installs (winget / Inno Setup {userpf}) under %LocalAppData%\Programs\Git were never found and the Cookbook reported "needs Git Bash" despite Git being installed.

Add the Programs\Git subfolder to the LocalAppData fallback root.

core/platform_compat.py

@@ -191,6 +191,8 @@ def _windows_bash_fallbacks() -> List[str]:
         base = os.environ.get(env_name)
         if base:
             roots.append(ntpath.join(base, "Git"))
+            if env_name == "LocalAppData":
+                roots.append(ntpath.join(base, "Programs", "Git"))
     roots.extend(_WINDOWS_BASH_DEFAULT_ROOTS)
 
     paths: List[str] = []