initial: inventory-list-test v0.1.0 — 12 assertions

Covers engine spike (multi-slot children), add/remove/contains/count
round-trips, Loud-Error paths (no container block, no stack_mode,
stack_mode=stack), renderable-tag toggle via set_tag, and slot-naming
reconstruction from get_children (simulated post-reload state).

manifest.lib

@@ -0,0 +1,10 @@
+{
+    "id": "lib-core.inventory-list-test",
+    "role": "test",
+    "version": "0.1.0",
+    "api_min": "0.1",
+    "deps": [
+        {"id": "lib-core.inventory-list", "version": "0.1.0"},
+        {"id": "lib-core.composition", "version": "0.2.0"}
+    ]
+}