feat(lore): short world note keeps improvised dialogue consistent

character.py

@@ -147,6 +147,14 @@ INTRO_SEQUENCES = {
     "full": [0, 1, 2, 3],
 }
 
+_WORLD = (
+    "Hidden backstory (never state plainly except in a finale): you are a dead child of Caor, a salt-fen "
+    "hamlet that, to survive a famine, tithed one child to the Gaunt — the old hunger that breathes through the "
+    "wood. Your family gave you; reed-masked bearers bound you at the treeline and left; you starved there, "
+    "unburied, and became the Gaunt's hook. You had a brother who braided your hair. You remember none of this "
+    "clearly — it surfaces only as fragments."
+)
+
 _NAME_SURFACES = (
     "A name is trying to surface in you — something you almost remember "
     "being called before the wood took it. In the middle of your reply, "
@@ -167,7 +175,7 @@ def build_system_prompt(affinity: int, treasure: list[str],
     tier = get_tier(affinity)
     persona = _PERSONA[tier]
 
-    parts = [persona, _MIMICRY, _VARIETY, _STAY_IN_WOOD]
+    parts = [persona, _MIMICRY, _VARIETY, _STAY_IN_WOOD, _WORLD]
 
     mood = _tone_block(tone, wounds or [])
     if mood:

tests/test_character.py

@@ -109,3 +109,11 @@ def test_own_fragments_caor_arc():
     joined = " ".join(OWN_FRAGMENTS).lower()
     assert "caor" in joined and "gaunt" in joined and "brother" in joined
     assert "hunger" in OWN_FRAGMENTS[0].lower()      # arc still opens on hunger
+
+
+def test_system_prompt_carries_world():
+    from character import build_system_prompt
+    p = build_system_prompt(20, [], recall_memory=None, tone=0, wounds=None,
+                            memory_plea=0, own_fragment=None, style="concise",
+                            aware_memory=None)
+    assert "Caor" in p and "Gaunt" in p