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

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

src/infrastructure/world/__init__.py

@@ -0,0 +1,29 @@
+"""World interface — engine-agnostic adapter pattern for embodied agents.
+
+Provides the ``WorldInterface`` ABC and an adapter registry so Timmy can
+observe, act, and speak in any game world (Morrowind, Luanti, Godot, …)
+through a single contract.
+
+Quick start::
+
+    from infrastructure.world import get_adapter, register_adapter
+    from infrastructure.world.interface import WorldInterface
+
+    register_adapter("mock", MockWorldAdapter)
+    world = get_adapter("mock")
+    perception = world.observe()
+"""
+
+from infrastructure.world.registry import AdapterRegistry
+
+_registry = AdapterRegistry()
+
+register_adapter = _registry.register
+get_adapter = _registry.get
+list_adapters = _registry.list_adapters
+
+__all__ = [
+    "register_adapter",
+    "get_adapter",
+    "list_adapters",
+]