feat: add support acp in common chat (#369)

sources/session/TurnLedger.hpp

@@ -0,0 +1,50 @@
+// Copyright (C) 2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE
+
+#pragma once
+
+#include <QHash>
+#include <QString>
+#include <QStringList>
+
+#include <functional>
+
+namespace QodeAssist::Session {
+
+class TurnLedger
+{
+public:
+    using PermissionResolver = std::function<void(const QString &optionId)>;
+    using PermissionCanceller = std::function<void()>;
+
+    TurnLedger() = default;
+    ~TurnLedger();
+    TurnLedger(const TurnLedger &) = delete;
+    TurnLedger &operator=(const TurnLedger &) = delete;
+
+    QString beginTurn(const QString &turnId);
+    QStringList endTurn();
+    QString activeTurnId() const;
+    bool hasActiveTurn() const;
+    bool isActiveTurn(const QString &turnId) const;
+
+    QString registerPermission(PermissionResolver resolve, PermissionCanceller cancel);
+    bool resolvePermission(const QString &requestId, const QString &optionId);
+    bool cancelPermission(const QString &requestId);
+    QStringList drainPermissions();
+    bool hasPendingPermission(const QString &requestId) const;
+    int pendingPermissionCount() const;
+
+private:
+    struct PendingPermission
+    {
+        PermissionResolver resolve;
+        PermissionCanceller cancel;
+    };
+
+    QString m_activeTurnId;
+    QHash<QString, PendingPermission> m_pending;
+};
+
+} // namespace QodeAssist::Session