feat(rules): restrict bless to allies in a 50-ft burst

SRD spells/bless.md: 'The caster and all allies within a 50-ft. burst,
centered on the caster'. Add an AreaEffect.targets filter (all/allies/
enemies) applied where area creatures are collected; bless.json now
declares radius_ft 50 and targets allies (the caster included).

src/pf1e_simulator/spells.py

@@ -33,6 +33,10 @@ SaveType = Literal["fort", "ref", "will", "none"]
 # point), cone (90° quarter circle from the caster), line (5-ft ray from the
 # caster to its length).
 AreaShape = Literal["burst", "cone", "line"]
+# PF1e area targeting (SRD spells/bless.md, spells/bane.md): a burst may
+# affect only allies ("The caster and all allies within a 50-ft. burst") or
+# only enemies ("Enemies within the area..."); the default affects everyone.
+AreaTargets = Literal["all", "allies", "enemies"]
 # PF1e casting times, normalized to budget codes (see combat._cast_time_slot).
 CastTime = Literal["standard", "swift", "immediate", "free", "full_round", "one_round", "long"]
 
@@ -226,11 +230,14 @@ class AreaEffect:
     - radius_ft: burst radius / cone length / line length, in feet
     - effects: the effects applied to each creature in the area
     - save_for_half: if True, successful save halves damage
+    - targets: which creatures in the area are affected ("all", "allies",
+      "enemies" — SRD bless/bane bursts)
     """
     shape: AreaShape = "burst"
     radius_ft: int = 20
     effects: tuple[SpellEffect, ...] = ()
     save_for_half: bool = True
+    targets: AreaTargets = "all"
 
 @dataclass(frozen=True)
 class SummonEffect:
@@ -358,6 +365,10 @@ def _is_area_shape(value: str) -> TypeGuard[AreaShape]:
     return value in get_args(AreaShape)
 
 
+def _is_area_targets(value: str) -> TypeGuard[AreaTargets]:
+    return value in get_args(AreaTargets)
+
+
 def _is_cast_time(value: str) -> TypeGuard[CastTime]:
     return value in get_args(CastTime)
 
@@ -566,11 +577,19 @@ def _parse_effect(data: Json) -> SpellEffect:
         if not _is_area_shape(shape_raw):
             msg = f"unknown area shape: {shape_raw!r} (expected one of {get_args(AreaShape)})"
             raise ValueError(msg)
+        targets_raw = _as_str(effect.get("targets", "all"))
+        if not _is_area_targets(targets_raw):
+            msg = (
+                f"unknown area targets: {targets_raw!r} "
+                f"(expected one of {get_args(AreaTargets)})"
+            )
+            raise ValueError(msg)
         return AreaEffect(
             shape=shape_raw,
             radius_ft=_as_int(effect.get("radius_ft", 20)),
             effects=tuple(_parse_effect(e) for e in _as_list(effect["effects"])),
             save_for_half=bool(effect.get("save_for_half", True)),
+            targets=targets_raw,
         )
     if effect_type == "summon":
         return SummonEffect(