Switch library hierarchy to GW webshop taxonomy

- warhammer_data.py: GW naming throughout - Space Marine chapters are
  their own factions under a 'Space Marines' group, systems match the
  shop (Age of Sigmar, The Horus Heresy, Other Games, The Old World,
  Middle-Earth), classes are GW shop categories (Battleline, Infantry,
  Vehicle, Walker, Flyer, Monster, Mounted, Hero, Titanic), group map
  extended to AoS grand alliances / Other Games / Old World / Middle-Earth
- gwshop.py: hierarchy remap - GW depth-4 paths are system/group/faction/
  class (the shop's last level is the class layer), depth-5 sources keep
  a subfaction before it; catalog snapshot regenerated accordingly
- sorter.py: catalog entry is hierarchy-authoritative (group, class, and
  faction when GW moved a unit or keyword tables are stale); generic GW
  branches ('Unit Type') and a Battleline default never degrade a
  confident keyword classification; whole-catalog retry when the faction
  pool has no confident match (handles units GW moved between factions);
  whole-catalog matching also runs when keyword classification found no
  faction; invalid (HTML) items never fuzzy-match; default catalog is
  now data/gwshop_catalog.json
- catalogue.py: --apply moves include the group layer, same structure
  as the sorter
- docs/SORTING.md: hierarchy rewritten to GW naming with examples
- tests: expectations updated to GW naming (chapters, unit types)
- verified live: 4/4 real files in the test batch now catalog-match,
  e.g. The Twin Lance -> 40k/Xenos Armies/T'au Empire/Epic Hero (GW's
  current placement) instead of the stale Drukhari keyword

tests/test_catalogue.py

@@ -15,22 +15,23 @@ from dlphelper.catalogue import classify  # noqa: E402
 
 CASES = [
     # (filename, expected system, expected faction, expected class or None-any)
-    ("Thunderwolf Cavalry.7z", "Warhammer 40,000", "Adeptus Astartes", "Fast Attack"),
-    ("Wulfen.zip", "Warhammer 40,000", "Adeptus Astartes", "Elites"),
-    ("Keeper of Secrets & Shalaxi Helbane.7z", "Warhammer 40,000", "Chaos Daemons", "HQ"),
+    # GW naming: chapters are factions, classes are GW unit types.
+    ("Thunderwolf Cavalry.7z", "Warhammer 40,000", "Space Wolves", "Mounted"),
+    ("Wulfen.zip", "Warhammer 40,000", "Space Wolves", "Infantry"),
+    ("Keeper of Secrets & Shalaxi Helbane.7z", "Warhammer 40,000", "Chaos Daemons", "Hero"),
     ("Assorted Drones.zip", "Warhammer 40,000", "T'au Empire", None),
-    ("Commander Shadowsun.zip", "Warhammer 40,000", "T'au Empire", "HQ"),
-    ("Devilfish.zip", "Warhammer 40,000", "T'au Empire", "Dedicated Transport"),
+    ("Commander Shadowsun.zip", "Warhammer 40,000", "T'au Empire", "Hero"),
+    ("Devilfish.zip", "Warhammer 40,000", "T'au Empire", "Vehicle"),
     ("Battle Sister Scanz.zip", "Warhammer 40,000", "Adepta Sororitas", None),
     ("Knights.zip", None, None, None),  # ambiguous keyword alone: unclassified
     ("Khorne Demon Enginez and skull lordz.zip", "Warhammer 40,000", "Chaos Daemons", None),
-    ("Cultists.zip", "Warhammer 40,000", "Chaos Space Marines", "Elites"),
+    ("Cultists.zip", "Warhammer 40,000", "Chaos Space Marines", "Battleline"),
     ("Da Troopz.zip", "Warhammer 40,000", "Orks", None),
-    ("Seraphon.zip", "Other Systems", "Age of Sigmar", None),
-    ("Leviathan Dreadnought.zip", "Warhammer 40,000", "Adeptus Astartes", "Elites"),
-    ("Poxwalkers.zip", "Warhammer 40,000", "Death Guard", "Elites"),
-    ("Kabalite Warriors.zip", "Warhammer 40,000", "Drukhari", "Troops"),
-    ("Canoptek Wraiths.zip", "Warhammer 40,000", "Necrons", "Fast Attack"),
+    ("Seraphon.zip", "Age of Sigmar", "Seraphon", None),
+    ("Leviathan Pattern Dreadnought.zip", "The Horus Heresy", "Space Marine Legions", "Walker"),
+    ("Poxwalkers.zip", "Warhammer 40,000", "Death Guard", "Infantry"),
+    ("Kabalite Warriors.zip", "Warhammer 40,000", "Drukhari", "Battleline"),
+    ("Canoptek Wraiths.zip", "Warhammer 40,000", "Necrons", "Infantry"),
     ("random thing with no keywords.zip", None, None, None),
 ]