checkpoint: secure assets and login flow baseline

scripts/asset-codec.mjs

@@ -0,0 +1,13 @@
+const KEY = new TextEncoder().encode('slogga-dist-assets-2026');
+
+export const encodeBytes = bytes =>
+{
+    const output = new Uint8Array(bytes.length);
+
+    for(let index = 0; index < bytes.length; index++)
+    {
+        output[index] = bytes[index] ^ KEY[index % KEY.length] ^ ((index * 31) & 255);
+    }
+
+    return output;
+};