phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

examples/encoding_min.hako

@@ -0,0 +1,8 @@
+static box Main {
+  main() {
+    local e = new EncodingBox()
+    local b64 = e.base64Encode("hello")
+    // quick check: "hello" -> aGVsbG8=
+    return b64.length() == 8
+  }
+}