Add extracted source directory and README navigation

extracted-source/node_modules/@anthropic-ai/sdk/internal/utils/bytes.mjs

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+export function concatBytes(buffers) {
+    let length = 0;
+    for (const buffer of buffers) {
+        length += buffer.length;
+    }
+    const output = new Uint8Array(length);
+    let index = 0;
+    for (const buffer of buffers) {
+        output.set(buffer, index);
+        index += buffer.length;
+    }
+    return output;
+}
+let encodeUTF8_;
+export function encodeUTF8(str) {
+    let encoder;
+    return (encodeUTF8_ ??
+        ((encoder = new globalThis.TextEncoder()), (encodeUTF8_ = encoder.encode.bind(encoder))))(str);
+}
+let decodeUTF8_;
+export function decodeUTF8(bytes) {
+    let decoder;
+    return (decodeUTF8_ ??
+        ((decoder = new globalThis.TextDecoder()), (decodeUTF8_ = decoder.decode.bind(decoder))))(bytes);
+}
+//# sourceMappingURL=bytes.mjs.map