Guard certutil read and close

Agent-Logs-Url: https://github.com/version-fox/vfox-python/sessions/130dc982-32c0-4ae6-8db0-e62d21f8918d

Co-authored-by: bytemain <13938334+bytemain@users.noreply.github.com>

Author: Copilot

lib/util.lua

@@ -462,9 +462,12 @@ local function verifyUvBuildArchive(path, sha256)
             error("Unable to verify uv-build archive sha256 for " .. path .. ": certutil command could not be started")
         end
 
-        local output = handle:read("*a")
-        handle:close()
-        if output == nil then
+        local readOk, output = pcall(function()
+            local data = handle:read("*a")
+            handle:close()
+            return data
+        end)
+        if not readOk or output == nil then
             error("Unable to verify uv-build archive sha256 for " .. path .. ": failed to read certutil output")
         end
         local actualSha256