feat(rules): nonlethal sources - unarmed strikes deal nonlethal by default (SRD Unarmed Attacks), Minimum Damage floor lands 1 nonlethal (CRB Damage), transcript + AttackResult expose the track

tests/test_conformance_energy.py

@@ -251,14 +251,16 @@ def test_dr_spares_the_energy_component_of_a_mixed_attack() -> None:
 
 def test_physical_only_damage_vs_dr_unchanged() -> None:
     """(h) a physical-only weapon keeps the exact old DR arithmetic (regression
-    lock for the split): 1d8 = 3 vs DR 5 reduces below 1 — the CRB "Damage"
-    Minimum Damage floor then leaves a landed hit dealing 1 (nonlethal is not
-    modeled: 1 point of normal damage)."""
+    lock for the split): 1d8 = 3 vs DR 5 reduces below 1 - the CRB "Damage"
+    Minimum Damage floor then leaves a landed hit dealing 1 point of
+    NONLETHAL damage (SRD "Nonlethal Damage": the floor never touches hp)."""
     weapon = _attack("warhammer", (("1d8", ("bludgeoning",)),))
     hero = _combatant("hero", attacks=(weapon,))
     foe = _combatant("foe").model_copy(update={"dr": DamageReduction(amount=5)})
     eng = _engine([hero, foe], [(0, 0), (0, 1)], ["players", "monsters"],
                   [15, 3])
     result = eng.resolve_attack(eng._states[0], eng._states[1], weapon)
-    assert result.damage == 1
-    assert eng._states[1].hp == 99  # the Minimum Damage floor lands 1 point
+    assert result.damage == 0
+    assert result.nonlethal == 1
+    assert eng._states[1].hp == 100  # the Minimum Damage floor is nonlethal
+    assert eng._states[1].nonlethal == 1