Rename constants to descriptive names (refactor step 1)

Pure rename, no behavior change; the full suite (RNG goldens,
generation invariants, scripted sessions, save round trip) is
unchanged and green.

- Creature flags: IsHuh→Confused, IsHalu→Hallucinating,
  CanHuh→CanConfuse, CanSee→CanSeeInvisible, IsRun→Awake,
  SeeMonst→SenseMonsters, IsCanc→Cancelled, IsLevit→Levitating,
  IsBlind/IsGreed/IsHaste/IsTarget/IsHeld/IsInvis/IsMean/IsRegen/
  IsFly/IsSlow → Blind/Greedy/Hasted/Targeted/Held/Invisible/Mean/
  Regenerates/Flying/Slowed, IsFound→Found
- Object flags: IsCursed→Cursed, IsKnow→Known, IsMissl→Missile,
  IsMany→Stackable, ObjIsFound→WasFound, IsProt→Protected
- Room flags: IsDark/IsGone/IsMaze → Dark/Gone/Maze; place flags:
  FPass→FPassage, FPNum→FPassNum, FTMask→FTrapMask
- Trap types: TDoor→TrapDoor ... TMyst→TrapMystery
- Item subtypes: P*→Potion* (PLSD→PotionLSD, PMFind→
  PotionDetectMonsters, ...), S*→Scroll* (SIDRorS→
  ScrollIdentifyRingOrStick, ...), R*→Ring* (RAddHit→RingDexterity,
  RNop→RingAdornment, ...), Ws*→Wand* (WsElect→WandLightning, ...),
  weapons (TwoSword→WeaponTwoHandedSword, Shiraken→WeaponShuriken,
  ...), armor (RingMail→ArmorRingMail, ...)
- Counts: Max{Potions,Scrolls,Rings,Sticks,Weapons,Armors} →
  Num{Potion,Scroll,Ring,Wand,Weapon,Armor}Types; NTraps→NumTrapTypes
- Level.NTraps field → TrapCount (also in the save snapshot)
- Original C constant names preserved as comment breadcrumbs in
  types.go so the lineage stays greppable

TODO.md: step 1 moved to Completed, step 2 (typed kinds) promoted to
Next Step.

game/effects_test.go

@@ -23,7 +23,7 @@ func TestQuaffHealingPotion(t *testing.T) {
 	g := mkGameInput(t, 5, "")
 	pot := newObject()
 	pot.Type = Potion
-	pot.Which = PHealing
+	pot.Which = PotionHealing
 	ch := give(g, pot)
 	g.scr.term.(*testTerm).input = []byte{ch}
 
@@ -32,7 +32,7 @@ func TestQuaffHealingPotion(t *testing.T) {
 	if g.Player.Stats.HP <= 1 {
 		t.Error("healing potion did not heal")
 	}
-	if !g.Items.Potions[PHealing].Know {
+	if !g.Items.Potions[PotionHealing].Know {
 		t.Error("healing potion not identified after drinking")
 	}
 	if len(g.Player.Pack) != 5 {
@@ -44,12 +44,12 @@ func TestQuaffConfusionSetsFlagAndFuse(t *testing.T) {
 	g := mkGameInput(t, 5, "")
 	pot := newObject()
 	pot.Type = Potion
-	pot.Which = PConfuse
+	pot.Which = PotionConfusion
 	ch := give(g, pot)
 	g.scr.term.(*testTerm).input = []byte{ch}
 
 	g.quaff()
-	if !g.Player.On(IsHuh) {
+	if !g.Player.On(Confused) {
 		t.Error("confusion potion did not confuse")
 	}
 	if g.findSlot(DUnconfuse) == nil {
@@ -59,7 +59,7 @@ func TestQuaffConfusionSetsFlagAndFuse(t *testing.T) {
 	for range 30 {
 		g.DoFuses(After)
 	}
-	if g.Player.On(IsHuh) {
+	if g.Player.On(Confused) {
 		t.Error("confusion never wore off")
 	}
 }
@@ -68,7 +68,7 @@ func TestReadEnchantArmor(t *testing.T) {
 	g := mkGameInput(t, 5, "")
 	scr := newObject()
 	scr.Type = Scroll
-	scr.Which = SArmor
+	scr.Which = ScrollEnchantArmor
 	ch := give(g, scr)
 	g.scr.term.(*testTerm).input = []byte{ch}
 
@@ -88,16 +88,16 @@ func TestReadHoldMonsterFreezesAdjacent(t *testing.T) {
 	// TestHoldScrollGreedyMonsterQuirk.
 	g := mkGameInput(t, 5, "")
 	tp := spawnAdjacent(g, 'Z')
-	tp.Flags.Set(IsRun)
+	tp.Flags.Set(Awake)
 	scr := newObject()
 	scr.Type = Scroll
-	scr.Which = SHold
+	scr.Which = ScrollHoldMonster
 	ch := give(g, scr)
 	g.scr.term.(*testTerm).input = []byte{ch}
 
 	g.readScroll()
 	t.Logf("after scroll: flags=%o huh=%q", tp.Flags, g.Msgs.Huh)
-	if tp.On(IsRun) || !tp.On(IsHeld) {
+	if tp.On(Awake) || !tp.On(Held) {
 		t.Error("hold monster scroll did not hold the adjacent monster")
 	}
 }
@@ -109,20 +109,20 @@ func TestReadHoldMonsterFreezesAdjacent(t *testing.T) {
 func TestHoldScrollGreedyMonsterQuirk(t *testing.T) {
 	g := mkGameInput(t, 5, "")
 	tp := spawnAdjacent(g, 'O')
-	tp.Flags.Set(IsRun)
+	tp.Flags.Set(Awake)
 	scr := newObject()
 	scr.Type = Scroll
-	scr.Which = SHold
+	scr.Which = ScrollHoldMonster
 	ch := give(g, scr)
 	g.scr.term.(*testTerm).input = []byte{ch}
 
 	g.readScroll()
-	t.Logf("orc after scroll: flags=%o (IsRun=%v IsHeld=%v)",
-		tp.Flags, tp.On(IsRun), tp.On(IsHeld))
-	if !tp.On(IsHeld) {
-		t.Error("orc lost IsHeld entirely")
+	t.Logf("orc after scroll: flags=%o (Awake=%v Held=%v)",
+		tp.Flags, tp.On(Awake), tp.On(Held))
+	if !tp.On(Held) {
+		t.Error("orc lost Held entirely")
 	}
-	if !tp.On(IsRun) {
+	if !tp.On(Awake) {
 		t.Error("quirk changed: greedy monster stayed held; if this is a " +
 			"deliberate fix, update this test and ARCHITECTURE.md")
 	}
@@ -133,7 +133,7 @@ func TestZapSlowMonster(t *testing.T) {
 	tp := spawnAdjacent(g, 'Z')
 	stick := newObject()
 	stick.Type = Stick
-	stick.Which = WsSlowM
+	stick.Which = WandSlowMonster
 	g.fixStick(stick)
 	ch := give(g, stick)
 	g.scr.term.(*testTerm).input = []byte{ch}
@@ -141,7 +141,7 @@ func TestZapSlowMonster(t *testing.T) {
 
 	charges := stick.Charges()
 	g.doZap()
-	if !tp.On(IsSlow) {
+	if !tp.On(Slowed) {
 		t.Error("slow monster wand did not slow")
 	}
 	if stick.Charges() != charges-1 {