feat: WorldInterface + Heartbeat v2 (#871, #872) (#900)

Co-authored-by: Perplexity Computer <perplexity@tower.local>
Co-committed-by: Perplexity Computer <perplexity@tower.local>

tests/infrastructure/world/test_tes3mp_adapter.py

@@ -0,0 +1,44 @@
+"""Tests for the TES3MP stub adapter."""
+
+import pytest
+
+from infrastructure.world.adapters.tes3mp import TES3MPWorldAdapter
+from infrastructure.world.types import CommandInput
+
+
+class TestTES3MPStub:
+    """Acceptance criterion: stub imports cleanly and raises NotImplementedError."""
+
+    def test_instantiates(self):
+        adapter = TES3MPWorldAdapter(host="127.0.0.1", port=25565)
+        assert adapter._host == "127.0.0.1"
+        assert adapter._port == 25565
+
+    def test_is_connected_default_false(self):
+        adapter = TES3MPWorldAdapter()
+        assert adapter.is_connected is False
+
+    def test_connect_raises(self):
+        adapter = TES3MPWorldAdapter()
+        with pytest.raises(NotImplementedError, match="connect"):
+            adapter.connect()
+
+    def test_disconnect_raises(self):
+        adapter = TES3MPWorldAdapter()
+        with pytest.raises(NotImplementedError, match="disconnect"):
+            adapter.disconnect()
+
+    def test_observe_raises(self):
+        adapter = TES3MPWorldAdapter()
+        with pytest.raises(NotImplementedError, match="observe"):
+            adapter.observe()
+
+    def test_act_raises(self):
+        adapter = TES3MPWorldAdapter()
+        with pytest.raises(NotImplementedError, match="act"):
+            adapter.act(CommandInput(action="move"))
+
+    def test_speak_raises(self):
+        adapter = TES3MPWorldAdapter()
+        with pytest.raises(NotImplementedError, match="speak"):
+            adapter.speak("Hello")