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/fight_test.go

@@ -25,7 +25,7 @@ func TestRollEmParsesMultiAttackDice(t *testing.T) {
 	g := mkGame(t, 42)
 	att := &Creature{Stats: Stats{Str: 16, Lvl: 20, Dmg: "1x4/1x4/1x4"}}
 	def := &Creature{Stats: Stats{Arm: 10, HP: 1000}}
-	def.Flags.Set(IsRun)
+	def.Flags.Set(Awake)
 	// With attacker level 20 vs armor 10, swing always hits
 	// (rnd(20)+wplus >= (20-20)-10 is always true), so three attacks of
 	// 1x4 + str bonus 1 each must deal between 6 and 15 damage.
@@ -60,7 +60,7 @@ func TestAttackHurtsPlayer(t *testing.T) {
 	g := mkGame(t, 9)
 	tp := spawnAdjacent(g, 'T') // troll: 1x8/1x8/2x6
 	tp.Stats.Lvl = 20           // always hits
-	tp.Flags.Clear(IsCanc)
+	tp.Flags.Clear(Cancelled)
 	hpBefore := g.Player.Stats.HP
 	g.Player.Stats.HP = 500
 	g.Player.Stats.MaxHP = 500
@@ -96,7 +96,7 @@ func TestRunnersChaseHero(t *testing.T) {
 	}
 	tp := &Monster{}
 	g.newMonster(tp, 'H', pos)
-	tp.Flags.Set(IsRun)
+	tp.Flags.Set(Awake)
 	tp.Dest = &p.Pos
 	d0 := distCp(tp.Pos, p.Pos)
 	g.runners(0)