Steps to reproduce:

Create a new URP 3D project
Confirm a URP asset is assigned in Project Settings > Graphics, and that the project has at least one material
Close the Editor
Open ProjectSettings/URPProjectSettings.asset and set m_LastMaterialVersion to 0, simulating a project last opened on an older URP
Import the project headlessly, the way a CI job does:
Unity -batchmode -nographics -quit -projectPath <project> -logFile ci.log
Inspect ProjectSettings/URPProjectSettings.asset and the .mat files under source control
Repeat step 5 without -quit as a control

Actual results:

The headless run exits with code 0 and no warning. m_LastMaterialVersion is unchanged at 0,
no .mat file is modified, and MaterialPostprocessor is not mentioned in the log at all.

The control run, identical except for the absence of -quit, performs the upgrade:

-quit m_LastMaterialVersion: 0 MaterialPostprocessor absent from log
control m_LastMaterialVersion: 11 MaterialPostprocessor ran

Opening the same project in the Editor afterwards shows the URP material upgrade dialog,
confirming the upgrade was still outstanding after the headless import.

Expected results: Either the material upgrade runs during the headless import, or the run logs a clear warning
that a required URP material upgrade was skipped and the project must be opened in the Editor
first. Compare ~~UUM-20743~~, where the expected behaviour for the HDRP equivalent was stated as:
upgrade the materials before the run, or prevent the run with a message.

Reproducible with versions: 6000.0.0f1, 6000.0.84f1, 6000.3.25f1, 6000.6.2f1, 6000.7.0b2, 7000.0.0a1

Tested on (OS): macOS 15 (Darwin 25.6.0), Apple Silicon