Add complete game content: Vogon ship, Heart of Gold, off-Earth, dream system

Engine refactoring:
- Replace hardcoded state attributes with generic state.flags dict
- Add death system (jigs_up/finish) with dream-restore callbacks
- Add inventory extras hook system (removes hardcoded headache/tea lines)
- Add 16 new verb handlers (consult, say, carve, plug, repair, kick, etc.)
- Add verb synonyms to parser

New content modules (25 rooms, 107 objects total):
- vogon.py: Hold, Captain's Quarters, Airlock; babel fish puzzle, poetry
  scene, airlock ejection sequence with timed events
- heart.py: 10 Heart of Gold rooms; Marvin tool quest, tea/no-tea paradox,
  Nutrimat overload, Infinite Improbability Drive puzzle, victory sequence
- unearth.py: Traal (Beast lair with towel/name/carve puzzle), War Chamber,
  Inside Whale, Maze with random exits and particle
- dark.py: Dream dispatch room with probabilistic destination selection,
  sensory discovery mechanic, dream-restore callback

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.vscode/settings.json

@@ -0,0 +1,42 @@
+{
+    "cSpell.words": [
+        "ACTORBIT",
+        "CONTBIT",
+        "DARKBIT",
+        "DOORBIT",
+        "DRINKBIT",
+        "fclear",
+        "fdesc",
+        "Infocom",
+        "INTEGRALBIT",
+        "ldesc",
+        "LIGHTBIT",
+        "MUNGEDBIT",
+        "NARTICLEBIT",
+        "NDESCBIT",
+        "ONBIT",
+        "OPENBIT",
+        "OUTSIDEBIT",
+        "prosser",
+        "prsa",
+        "prsi",
+        "prso",
+        "READBIT",
+        "REVISITBIT",
+        "RLANDBIT",
+        "SEARCHBIT",
+        "superbrief",
+        "SURFACEBIT",
+        "TAKEBIT",
+        "TOOLBIT",
+        "TOUCHBIT",
+        "traal",
+        "TRANSBIT",
+        "TRYTAKEBIT",
+        "VEHBIT",
+        "vogon",
+        "VOWELBIT",
+        "WEARBIT",
+        "WORNBIT"
+    ]
+}