Immortal now shows as an app tile on the Portal TV's stock home (ripleyhome).
The TV home is an Android-TV (Leanback) launcher — it only lists apps that declare a Leanback launcher entry (VLC, the Vewd browser, …), which is why Immortal didn't appear there. Immortal now declares one, with a TV banner, via a launcher-only alias (no HOME category, so it isn't filtered as a home app). It opens the normal launcher. With the Calls→stock-home bridge, you can move between Immortal and the stock home in both directions.
Verified on the Portal TV: the Immortal tile appears in the app row and launches the launcher. Existing installs update in place.