fix: name and announce every narrowed pack

wiki/advanced-usage.md

@@ -158,8 +158,9 @@ selects by hash. `pipeline.py` never passes it, so the released packs stay
 complete.
 
 Every dimension that removes files appears in the output filename and in the
-pack README, because both are built from the same list (`_narrowings` in
-`generate_pack.py`). A pack narrowed three ways is called
+pack README, because the five places that name an artefact (the pack, the
+`--split` rename, the `_Split` directory, the grouped-alias rename and the
+manifest) all build from one list (`_narrowings` in `generate_pack.py`). A pack narrowed three ways is called
 `Recalbox_10.0.8_NorthAmerica_OnePerSlot_Required_BIOS_Pack.zip` and opens with
 a `PACK TYPE: Narrowed` block listing the three. Adding a new way to narrow a
 pack means adding it to that list, so it cannot reach users nameless or