Move all package-level vars into gameData; finish lint adoption

gochecknoglobals: all 37 package-level tables consolidated into the
gameData struct (game/tables.go), built by newGameData() and carried
on RogueGame as g.data (set in NewGame and Restore). ObjectKind
Glyph()/objectKindForGlyph are now switches; the table-reading subtype
Stringer methods are gone; isMagic is a RogueGame method.

goconst: repeated words named (potionName/scrollName/ringName/goldName
in object.go, wandName/staffName in sticks.go, ripWall in tables.go).

exhaustive, testpackage: disabled in .golangci.yml with sneak's
approval (2026-07-07).

Also reverts misspell's silent corruption of the "ther" scroll-name
syllable (it had become "there", changing generated scroll names vs C).

Remaining red: cyclop/gocognit/nestif until refactor step 7; mnd
awaits a ruling. TODO.md rotated; MEMORY.md lint notes updated.

game/things.go

@@ -17,9 +17,9 @@ func (g *RogueGame) invName(obj *Object, drop bool) string {
 
 	switch obj.Kind {
 	case KindPotion:
-		g.nameit(&pb, obj, "potion", it.PotColors[which], &it.Potions[which], nullstr)
+		g.nameit(&pb, obj, potionName, it.PotColors[which], &it.Potions[which], nullstr)
 	case KindRing:
-		g.nameit(&pb, obj, "ring", it.RingStones[which], &it.Rings[which], ringNum)
+		g.nameit(&pb, obj, ringName, it.RingStones[which], &it.Rings[which], ringNum)
 	case KindWand:
 		g.nameit(&pb, obj, it.WandType[which], it.WandMade[which], &it.Sticks[which], chargeStr)
 	case KindScroll:
@@ -78,7 +78,7 @@ func (g *RogueGame) invName(obj *Object, drop bool) string {
 	case KindArmor:
 		sp := it.Armors[which].Name
 		if obj.Flags.Has(Known) {
-			fmt.Fprintf(&pb, "%s %s [", num(aClass[which]-obj.ArmorClass, 0, Armor), sp)
+			fmt.Fprintf(&pb, "%s %s [", num(g.data.aClass[which]-obj.ArmorClass, 0, Armor), sp)
 
 			if !g.Options.Terse {
 				pb.WriteString("protection ")
@@ -257,7 +257,7 @@ func (g *RogueGame) newThing() *Object {
 		cur.Kind = KindArmor
 		cur.Which = pickOne(g, g.Items.Armors[:])
 
-		cur.ArmorClass = aClass[cur.Which]
+		cur.ArmorClass = g.data.aClass[cur.Which]
 		if r := g.rnd(100); r < 20 {
 			cur.Flags.Set(Cursed)
 			cur.ArmorClass += g.rnd(3) + 1
@@ -536,11 +536,11 @@ func (g *RogueGame) nothing(typ byte) string {
 
 		switch typ {
 		case Potion:
-			tystr = "potion"
+			tystr = potionName
 		case Scroll:
-			tystr = "scroll"
+			tystr = scrollName
 		case Ring:
-			tystr = "ring"
+			tystr = ringName
 		case Stick:
 			tystr = "stick"
 		}