core utils updates

kernel/bin/edit

@@ -60,6 +60,33 @@ function barePosixBlocks(size) {
   return Math.ceil(Number(size) / 512) || 0
 }
 
+/**
+ * Raw stdout for NUL/binary when **`process.stdout.write`** is missing.
+ * If **`ctx.bareOsBinWrite(Uint8Array|string)`** is set (tests / host), use it.
+ * @param {Record<string, unknown>} ctx
+ * @param {string | Uint8Array} chunk
+ * @returns {boolean}
+ */
+function bareOsEmitRaw(ctx, chunk) {
+  if (typeof ctx.bareOsBinWrite === 'function') {
+    const b4 = ctx.b4a
+    const u8 =
+      typeof chunk === 'string'
+        ? b4 && typeof b4.from === 'function'
+          ? b4.from(chunk)
+          : new TextEncoder().encode(chunk)
+        : chunk
+    ctx.bareOsBinWrite(u8 instanceof Uint8Array ? u8 : new Uint8Array(u8))
+    return true
+  }
+  const w = globalThis.process?.stdout?.write
+  if (typeof w === 'function') {
+    w.call(globalThis.process.stdout, chunk)
+    return true
+  }
+  return false
+}
+
 /** ANSI helpers for /bin/edit (preamble; no import in src). */
 
 const EDIT_ANSI_RESET = '\x1b[0m'