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/game.go

@@ -3,19 +3,19 @@ package game
 // ItemLore is the per-game item identity state: the randomized appearance
 // names and the seven mutable ObjInfo tables (extern.c/init.c).
 type ItemLore struct {
-	PotColors  [MaxPotions]string // p_colors: colors of the potions
-	ScrNames   [MaxScrolls]string // s_names: names of the scrolls
-	RingStones [MaxRings]string   // r_stones: stone settings of the rings
-	WandMade   [MaxSticks]string  // ws_made: what sticks are made of
-	WandType   [MaxSticks]string  // ws_type: "wand" or "staff"
+	PotColors  [NumPotionTypes]string // p_colors: colors of the potions
+	ScrNames   [NumScrollTypes]string // s_names: names of the scrolls
+	RingStones [NumRingTypes]string   // r_stones: stone settings of the rings
+	WandMade   [NumWandTypes]string   // ws_made: what sticks are made of
+	WandType   [NumWandTypes]string   // ws_type: "wand" or "staff"
 
 	Things  [NumThings]ObjInfo
-	Potions [MaxPotions]ObjInfo
-	Scrolls [MaxScrolls]ObjInfo
-	Rings   [MaxRings]ObjInfo
-	Sticks  [MaxSticks]ObjInfo
-	Weapons [MaxWeapons + 1]ObjInfo
-	Armors  [MaxArmors]ObjInfo
+	Potions [NumPotionTypes]ObjInfo
+	Scrolls [NumScrollTypes]ObjInfo
+	Rings   [NumRingTypes]ObjInfo
+	Sticks  [NumWandTypes]ObjInfo
+	Weapons [NumWeaponTypes + 1]ObjInfo
+	Armors  [NumArmorTypes]ObjInfo
 
 	Group int // group number for the next stack of missiles (weapons.c `group`)
 }
@@ -168,7 +168,7 @@ func NewGame(cfg Config) *RogueGame {
 	g.FileName = cfg.Home + "/rogue.save"
 	g.rogueOpts = cfg.RogueOpts
 	if cfg.Wizard {
-		g.Player.Flags.Set(SeeMonst)
+		g.Player.Flags.Set(SenseMonsters)
 	}
 	if cfg.RogueOpts != "" {
 		g.ParseOpts(cfg.RogueOpts)
@@ -177,7 +177,7 @@ func NewGame(cfg Config) *RogueGame {
 	g.Monsters = monsterTable
 	g.Items.Group = 2 // weapons.c: int group = 2
 	for i := range g.Level.Passages {
-		g.Level.Passages[i].Flags = IsGone | IsDark
+		g.Level.Passages[i].Flags = Gone | Dark
 	}
 
 	g.initProbs()     // set up prob tables for objects