Make PARSE/PARSE-NAME inline host functions, fix stack residue cascade

PARSE and PARSE-NAME were using the deferred pending mechanism which
broke when called from compiled code (the calling word continued
executing before PARSE ran). Replaced with inline host functions that
read >IN/#TIB directly from WASM memory and parse immediately.

This fixes utilities.fth $"/$2" failures that left stack residue
cascading into all subsequent compliance test suites.

Also: core_ext 17→14, string 27→17.

test_js.js

@@ -0,0 +1,63 @@
+// WAFER JS Loader - generated by wafer build --js
+// Loads and runs test_js.wasm in the browser.
+
+const WAFER = (() => {
+  const CELL_SIZE = 4;
+  const DATA_STACK_TOP = 0x1540;
+  const SYSVAR_BASE = 0x0004;
+  let outputCallback = (s) => {
+    const el = document.getElementById('output');
+    if (el) el.textContent += s;
+    else console.log(s);
+  };
+
+  async function run(opts) {
+    if (opts && opts.output) outputCallback = opts.output;
+
+    const memory = new WebAssembly.Memory({ initial: 16 });
+    const dsp = new WebAssembly.Global({ value: 'i32', mutable: true }, 5440);
+    const rsp = new WebAssembly.Global({ value: 'i32', mutable: true }, 9536);
+    const fsp = new WebAssembly.Global({ value: 'i32', mutable: true }, 11584);
+    const table = new WebAssembly.Table({ element: 'anyfunc', initial: 256 });
+
+    function emit(code) {
+      outputCallback(String.fromCharCode(code));
+    }
+
+    const importObject = {
+      env: { emit, memory, dsp, rsp, fsp, table }
+    };
+
+    // Register host functions
+    const view = () => new DataView(memory.buffer);
+    const pop = () => {
+      const sp = dsp.value;
+      const v = view().getInt32(sp, true);
+      dsp.value = sp + CELL_SIZE;
+      return v;
+    };
+    const push = (v) => {
+      const sp = dsp.value - CELL_SIZE;
+      view().setInt32(sp, v, true);
+      dsp.value = sp;
+    };
+
+    table.set(84, new WebAssembly.Function({parameters:[], results:[]}, () => {
+      const n = pop();
+      const base = view().getUint32(SYSVAR_BASE, true);
+      outputCallback((base === 16 ? n.toString(16).toUpperCase() : n.toString()) + ' ');
+    }));
+
+    const response = await fetch('test_js.wasm');
+    const bytes = await response.arrayBuffer();
+    const { instance } = await WebAssembly.instantiate(bytes, importObject);
+
+    if (instance.exports._start) {
+      instance.exports._start();
+    }
+
+    return instance;
+  }
+
+  return { run };
+})();