fix(spells): correct the sound burst save

PF1e (SRD spells/sound-burst.md): "Every creature in the area takes 1d8 points of sonic damage and must succeed on a Fortitude save to avoid being stunned for 1 round" — the Fortitude partial negates the stun only, never the dice. The damage component declared half_on_save: true, halving the sonic damage on a successful save. DamageEffect gains a save_negates flag (default True, existing behavior unchanged); sound_burst.json declares half_on_save: false + save_negates: false so the 1d8 is full regardless while the condition keeps save_negates. README updated.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

README.md

@@ -1097,7 +1097,10 @@ Règles modélisées :
   Constitution — le sort primaire réutilise son jet déjà effectué) ; un succès
    annule ou divise par deux selon ce que l'effet déclare (`save_negates` /
    `half_on_save` / `AreaEffect.save_for_half`) — les zones « sauvegarde
-  annule » (Sleep, Color Spray, Web) sauvent donc aussi.
+   annule » (Sleep, Color Spray, Web) sauvent donc aussi. Une composante de
+   dégâts peut déclarer `save_negates: false` (conformance D1 — SRD
+   « Sound Burst » : « Fortitude partial » n'annule que l'étourdissement,
+   jamais les dés) : la sauvegarde réussie ne réduit alors pas ces dégâts.
 - Dons : les 8 PJ portent 55 noms de dons uniques ; le chargeur résout chacun d'eux
   soit vers un effet réel (Power Attack actif, Weapon Focus ciblé par arme, Toughness
   lié au niveau, dons passifs via `_stat_modifiers`), soit vers un « no-op » tracé en

data/spells/sound_burst.json

@@ -10,13 +10,14 @@
     {
       "type": "area",
       "radius_ft": 10,
-      "save_for_half": true,
+      "save_for_half": false,
       "effects": [
         {
           "type": "damage",
           "formula": "1d8",
           "types": ["sonic"],
-          "half_on_save": true
+          "half_on_save": false,
+          "save_negates": false
         },
         {
           "type": "condition",
@@ -27,5 +28,5 @@
       ]
     }
   ],
-  "description": "A tremendous cacophony blasts a 10-ft.-radius spread: every creature in the area takes 1d8 points of sonic damage and must succeed on a Fortitude save or be stunned for 1 round (Fortitude partial — modeled as save for half damage and negates the stun). Creatures that cannot hear take the damage but are not stunned (not modeled)."
+  "description": "A tremendous cacophony blasts a 10-ft.-radius spread: every creature in the area takes 1d8 points of sonic damage and must succeed on a Fortitude save to avoid being stunned for 1 round (SRD spells/sound-burst.md: the save only negates the stun - the damage is full regardless). Creatures that cannot hear take the damage but are not stunned (not modeled)."
 }

src/pf1e_simulator/combat.py

@@ -5534,7 +5534,7 @@ class CombatEngine:
             raw = effect.formula.max_value()
         if saved and effect.half_on_save:
             dmg = max(0, raw // 2)
-        elif saved:
+        elif saved and effect.save_negates:
             dmg = 0
         else:
             dmg = raw

src/pf1e_simulator/spells.py

@@ -39,6 +39,11 @@ class DamageEffect:
     types: tuple[str, ...]
     # False = save negates (targeted); True = half damage on save (ray/line/cone/AoE)
     half_on_save: bool = False
+    # Only consulted when half_on_save is False. True = a successful save deals
+    # no damage (save negates, the targeted-spell default); False = the save has
+    # no effect on this damage at all (SRD Sound Burst: "Fortitude partial"
+    # negates only the stun — every creature takes the full dice regardless).
+    save_negates: bool = True
 
 
 @dataclass(frozen=True)
@@ -258,6 +263,7 @@ def _parse_effect(data: Json) -> SpellEffect:
             formula=parse_dice(_as_str(effect["formula"])),
             types=tuple(_as_str(t) for t in _as_list(effect["types"])),
             half_on_save=bool(effect.get("half_on_save", False)),
+            save_negates=bool(effect.get("save_negates", True)),
         )
     if effect_type == "condition":
         return ConditionEffect(

tests/test_spells.py

@@ -390,7 +390,10 @@ class TestAreaSavesPerSpellSaveType:
         )
         engine._cast_spell(c, t, "Sound Burst")
         assert any(ac.condition.name == "stunned" for ac in c.active_conditions)
-        assert t.hp == 200 - 1  # saved: 3 // 2
+        # SRD spells/sound-burst.md: the save only avoids the stun — the 1d8
+        # sonic damage is full regardless (save_negates: false on the damage).
+        assert t.hp == 200 - 3  # saved: full damage, no stun
+        assert not any(ac.condition.name == "stunned" for ac in t.active_conditions)
 
 
 class TestTargetedSpellSaveNegates: