Phase 10.7/10.5c: include cycle detection (VM/Interpreter), minimal pyc IR→Nyash, String unification bridge (VM partial), add core plugins: RegexBox/EncodingBox/TOMLBox/PathBox + examples; wire nyash.toml; begin String interop for internal vs plugin boxes; update CURRENT_TASK.md

examples/cycle_a.nyash

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+// Cycle test A -> B -> A
+include "examples/cycle_b.nyash"
+
+static box A {
+  main() {
+    return 0
+  }
+}
+

examples/cycle_b.nyash

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+// Cycle test B -> A
+include "examples/cycle_a.nyash"
+
+static box B {
+  main() {
+    return 0
+  }
+}
+

examples/encoding_min.nyash

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

examples/path_min.nyash

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+static box Main {
+  main() {
+    local p = new PathBox()
+    local j = p.join("/usr", "bin")
+    local b = p.basename(j)
+    return b
+  }
+}

examples/plugin_box_as_arg_demo.nyash

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+// プラグインBoxが箱を引数に取る例のデモ
+
+// HttpServer/Request/Responseの例
+local server = new HttpServerBox()
+server.start(8080)
+
+// acceptはHttpRequestBoxを返す
+local request = server.accept()  // returns box
+
+// HttpResponseBoxを作成
+local response = new HttpResponseBox()
+response.setStatus(200)
+response.setHeader("Content-Type", "text/plain")
+response.write("Hello from Nyash!")
+
+// ★ HttpRequestBox.respond()はHttpResponseBox（別の箱）を引数に取る！
+request.respond(response)  // Box引数の実例！
+
+// 他の例：ArrayBoxにプラグインBoxを格納
+local array = new ArrayBox()
+local file1 = new FileBox()
+local file2 = new FileBox()
+
+// ArrayBoxは任意のBoxを引数に取れる
+array.push(file1)  // FileBox（プラグインBox）を引数に
+array.push(file2)  // 別のFileBoxインスタンスも
+
+// MapBoxでも同様
+local map = new MapBox()
+local net = new HttpClientBox()
+
+// MapBoxも任意のBoxを値として設定できる
+map.set("client", net)  // HttpClientBox（プラグインBox）を引数に
+
+print("Plugin boxes can take other boxes as arguments!")

examples/regex_min.nyash

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+static box Main {
+  main() {
+    local r = new RegexBox()
+    r.compile("a+")
+    return r.isMatch("caaab")
+  }
+}
+

examples/toml_min.nyash

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+static box Main {
+  main() {
+    local t = new TOMLBox()
+    t.parse("[a]\nvalue=42\n")
+    local j = t.toJson()
+    return j
+  }
+}