Analyzer安定化完了: NYASH_DISABLE_PLUGINS=1復元 + plugin無効化根治

## 修正内容
1. **hako_check.sh/run_tests.sh**: NYASH_DISABLE_PLUGINS=1 + NYASH_BOX_FACTORY_POLICY=builtin_first追加
2. **src/box_factory/plugin.rs**: NYASH_DISABLE_PLUGINS=1チェック追加
3. **src/box_factory/mod.rs**: plugin shortcut pathでNYASH_DISABLE_PLUGINS尊重
4. **tools/hako_check/render/graphviz.hako**: smart quotes修正（parse error解消）

## 根本原因
- NYASH_USE_PLUGIN_BUILTINS=1が自動設定され、ArrayBox/MapBoxがplugin経由で生成を試行
- bid/registry.rsで"Plugin loading temporarily disabled"の状態でも試行されエラー
- mod.rs:272のshortcut pathがNYASH_DISABLE_PLUGINSを無視していた

## テスト結果
- 10/11 PASS（HC011,13-18,21-22,31）
- HC012: 既存issue（JSON安定化未完）

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/cli/args.rs

@@ -11,6 +11,15 @@ pub fn parse() -> CliConfig {
             if let Ok(json) = serde_json::to_string(&script_args) {
                 std::env::set_var("NYASH_SCRIPT_ARGS_JSON", json);
             }
+            // Provide HEX-escaped JSON as an alternate robust path for multiline/special bytes
+            // Each arg is encoded as lowercase hex of its UTF-8 bytes
+            let hex_args: Vec<String> = script_args
+                .iter()
+                .map(|s| hex_encode_utf8(s))
+                .collect();
+            if let Ok(hex_json) = serde_json::to_string(&hex_args) {
+                std::env::set_var("NYASH_SCRIPT_ARGS_HEX_JSON", hex_json);
+            }
         }
         let matches = build_command()
             .try_get_matches_from(&argv[..pos])
@@ -97,6 +106,17 @@ pub fn build_command() -> Command {
         .arg(Arg::new("build-target").long("target").value_name("TRIPLE").help("Target triple for --build"))
 }
 
+fn hex_encode_utf8(s: &str) -> String {
+    let bytes = s.as_bytes();
+    let mut out = String::with_capacity(bytes.len() * 2);
+    const HEX: &[u8; 16] = b"0123456789abcdef";
+    for &b in bytes {
+        out.push(HEX[(b >> 4) as usize] as char);
+        out.push(HEX[(b & 0x0f) as usize] as char);
+    }
+    out
+}
+
 pub fn from_matches(matches: &ArgMatches) -> CliConfig {
     if matches.get_flag("stage3") { std::env::set_var("NYASH_NY_COMPILER_STAGE3", "1"); }
     if let Some(a) = matches.get_one::<String>("ny-compiler-args") { std::env::set_var("NYASH_NY_COMPILER_CHILD_ARGS", a); }