Clarify uv-build pip messages

Agent-Logs-Url: https://github.com/version-fox/vfox-python/sessions/07e4e50a-f299-4a36-a8b8-405f0222677a

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

Author: Copilot

lib/util.lua

@@ -586,7 +586,7 @@ local function ensureWindowsUvBuildPip(path)
     end
 
     if not pathExists(path .. "\\Lib\\ensurepip\\__init__.py") then
-        print("Warning: uv-build Python does not include ensurepip; pip was not installed.")
+        print("Warning: uv-build Python does not include ensurepip; skipping pip installation.")
         return
     end
 
@@ -610,7 +610,7 @@ local function ensureWindowsUvBuildPip(path)
     end
 
     if not pathExists(path .. "\\Scripts\\pip.exe") then
-        error("Install pip script failed: pip.exe was not created")
+        error("Failed to install pip: pip.exe was not created after installation attempts")
     end
 end