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

tools/selfhost/gen_v1_from_builder.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+# gen_v1_from_builder.sh — Generate MIR JSON v1 via builder (emit_return_int)
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+source "$ROOT/tools/smokes/v2/lib/test_runner.sh" 2>/dev/null || true
+
+code=$(cat <<'HCODE'
+using lang.compiler.pipeline_v2.emit_return_box as EmitReturnBox
+static box Main { method main(args) {
+  local j = EmitReturnBox.emit_return_int2(42, 0)
+  print("" + j)
+  return 0
+} }
+HCODE
+)
+
+NYASH_USING_AST=1 NYASH_DISABLE_NY_COMPILER=1 HAKO_DISABLE_NY_COMPILER=1 \
+NYASH_PARSER_STAGE3=1 HAKO_PARSER_STAGE3=1 NYASH_PARSER_ALLOW_SEMICOLON=1 \
+run_nyash_vm -c "$code" 2>/dev/null | tr -d '\r'