adding new files

python/lowlevel_test_wasm/basic_test.py

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+import wasmtime
+import ctypes
+
+# --- Engine ---
+engine = wasmtime.Engine()
+
+# --- Store ---
+store = wasmtime.Store(engine)
+
+# --- WASI config ---
+wasi = wasmtime.WasiConfig()
+wasi.argv = ["basisu_module_st"]
+wasi.inherit_stdout()   # <-- tell WASI to use the host stdout
+wasi.inherit_stderr()
+store.set_wasi(wasi)
+
+# --- Load module ---
+module = wasmtime.Module.from_file(engine, "basisu_py/wasm/basisu_module_st.wasm")
+
+# --- Linker + WASI ---
+linker = wasmtime.Linker(engine)
+linker.define_wasi()
+
+# --- Instantiate ---
+instance = linker.instantiate(store, module)
+print("Single-threaded WASM instantiated OK")
+
+# --- Exports ---
+exports = instance.exports(store)
+
+get_version = exports["bu_get_version"]
+alloc       = exports["bu_alloc"]
+free        = exports["bu_free"]
+memory      = exports["memory"]
+
+# --- Version ---
+version = get_version(store)
+print("Version =", version)
+
+# --- Alloc ---
+ptr = alloc(store, 64)
+print("Allocated ptr =", ptr)
+
+# --- Access WASM memory properly ---
+data_len = memory.data_len(store)
+raw_ptr  = memory.data_ptr(store)            # ctypes pointer
+addr     = ctypes.addressof(raw_ptr.contents)  # convert to integer pointer
+
+# Create a byte array view into WASM memory
+buf = (ctypes.c_ubyte * data_len).from_address(addr)
+
+# Write TEST at allocated ptr
+buf[ptr : ptr + 4] = b"TEST"
+print("Wrote TEST into WASM memory.")
+
+# --- Free ---
+free(store, ptr)
+print("Memory free OK.")