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/tables_test.go

@@ -17,7 +17,7 @@ func TestProbabilitiesSumTo100(t *testing.T) {
 		"scrolls": baseScrInfo[:],
 		"rings":   baseRingInfo[:],
 		"sticks":  baseWsInfo[:],
-		"weapons": baseWeapInfo[:MaxWeapons], // excludes the flame entry
+		"weapons": baseWeapInfo[:NumWeaponTypes], // excludes the flame entry
 		"armor":   baseArmInfo[:],
 	}
 	for name, tab := range tables {
@@ -29,11 +29,11 @@ func TestProbabilitiesSumTo100(t *testing.T) {
 
 func TestInitProbsCumulative(t *testing.T) {
 	g := NewGame(Config{Seed: 1})
-	last := g.Items.Potions[MaxPotions-1].Prob
+	last := g.Items.Potions[NumPotionTypes-1].Prob
 	if last != 100 {
 		t.Errorf("cumulative potion probability ends at %d, want 100", last)
 	}
-	for i := 1; i < MaxPotions; i++ {
+	for i := 1; i < NumPotionTypes; i++ {
 		if g.Items.Potions[i].Prob < g.Items.Potions[i-1].Prob {
 			t.Errorf("potion probs not nondecreasing at %d", i)
 		}