perf(core): typed calling convention for words with a known stack effect

Such a word now compiles to a fast entry (i32 x p) -> (i32 x q) carrying
its stack items as WASM values, plus the usual ( -- ) wrapper that keeps
the table slot, so EXECUTE / interpreter / host words / CATCH see the
unchanged memory ABI. Fib(25) 1035 -> 366 us, 4.3x slower than sf64 ->
1.2x; the default guards-on config 1740 -> 361 us. WS-006.

crates/core/src/export.rs

@@ -126,6 +126,7 @@ pub fn export_module(
         table_size,
         &export_sections,
         vm.stack_guard_param(),
+        vm.typed_calls(),
     )
     .map_err(|e| anyhow::anyhow!("export codegen error: {e}"))?;