WebAssembly support via WAMR interpreter

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Pure Elixir WASM binary parser + WAMR interpreter integration.

Elixir API — supervised instances, same conventions as QuickBEAM.start/1:

{:ok, pid} = QuickBEAM.WASM.start(module: wasm_bytes, name: :add)
{:ok, 42}  = QuickBEAM.WASM.call(:add, "add", [40, 2])
QuickBEAM.WASM.stop(:add)

# Supervision tree
children = [{QuickBEAM.WASM, name: :renderer, module: wasm_bytes}]

JS WebAssembly API — spec-compliant global inside QuickBEAM runtimes:

const {instance} = await WebAssembly.instantiate(wasmBytes);
instance.exports.add(40, 2); // => 42

WebAssembly.validate(bytes);
WebAssembly.compile(bytes);
new WebAssembly.Module(bytes);
WebAssembly.Module.exports(mod);

Disassembler — pure Elixir .wasm parser, same {offset, name, ...operands} tuples as QuickBEAM.Bytecode:

{:ok, mod} = QuickBEAM.WASM.disasm(wasm_bytes)
hd(mod.functions).opcodes
# [{0, :local_get, 0}, {2, :local_get, 1}, {4, :i32_add}, {5, :end}]

Memory access:

:ok = QuickBEAM.WASM.write_memory(pid, 0, "hello")
{:ok, "hello"} = QuickBEAM.WASM.read_memory(pid, 0, 5)
{:ok, 65536} = QuickBEAM.WASM.memory_size(pid)

36 tests (19 parser, 10 runtime, 7 JS API).