fix(rules): duplicate summons get disambiguated ids - the engine now counts id occurrences (seeded from the deployed roster) and gives each new summon of the same creature a build_states-style suffix (celestial_wolf, celestial_wolf-2, ...), so two summons no longer share one _LiveStats slot (the second summon used to reset the first one's counters and their attrition merged); run_encounter aggregation verified to report each slot separately; runner 'known limitation' comment updated; +4 tests (id split, distinct slots, per-slot attrition, run_encounter aggregate)

tests/test_runner.py

@@ -269,3 +269,30 @@ def test_run_encounter_with_summon_aggregates_summoned_ids() -> None:
     wolf = report.attrition["celestial_wolf"]
     assert wolf.damage_dealt >= 0.0
     assert report.wins["players"] + report.wins["monsters"] + report.draws == 5
+
+
+def test_run_encounter_splits_duplicate_summons() -> None:
+    """Two summons of the same creature no longer share one stats slot: the
+    engine disambiguates ids the way build_states does, and the aggregation
+    reports each summoned creature separately.
+
+    The summoning policy casts every round while slots remain, so a level-3
+    caster (1 round/level duration) raises at least two concurrent wolves; the
+    second is celestial_wolf-2. Before the fix both merged into one slot.
+    """
+    spec = EncounterSpec(
+        map=make_map(),
+        sides=(
+            Side(name="players", combatants=(_make_runner_caster(),), zone="A"),
+            Side(
+                name="monsters",
+                combatants=(make_combatant("gob", hp=30, speed=0),),
+                zone="B",
+            ),
+        ),
+        round_cap=10,
+    )
+    report = run_encounter(spec, runs=1, seed=11, policy=_summoning_policy)
+    assert "celestial_wolf" in report.attrition
+    assert "celestial_wolf-2" in report.attrition
+    assert report.attrition["celestial_wolf-2"].damage_dealt >= 0.0