refactor: Move to agent architecture

sources/Session/ContextAssembler.hpp

@@ -0,0 +1,58 @@
+// Copyright (C) 2024-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE
+
+#pragma once
+
+#include <ContextData.hpp>
+
+#include <QString>
+#include <QStringList>
+#include <QVector>
+
+#include <functional>
+#include <vector>
+
+namespace QodeAssist {
+
+class Message;
+
+namespace ContextAssembler {
+
+using ContentLoader = std::function<QString(const QString &storedPath)>;
+
+struct PinnedBlock
+{
+    QString id;
+    QString text;
+};
+
+struct Manifest
+{
+    qsizetype systemChars = 0;
+    int historyMessages = 0;
+    int wireMessages = 0;
+    qsizetype textChars = 0;
+    qsizetype thinkingChars = 0;
+    qsizetype toolChars = 0;
+    qsizetype pinnedChars = 0;
+    int imageBlocks = 0;
+    int toolUseBlocks = 0;
+    int toolResultBlocks = 0;
+    int pinnedBlocks = 0;
+    int unsupportedBlocks = 0;
+    bool hasCompletionContext = false;
+    QStringList elided;
+
+    QString summary() const;
+};
+
+Templates::ContextData assemble(
+    const std::vector<Message> &history,
+    const QString &systemPrompt,
+    const ContentLoader &loader,
+    const QVector<PinnedBlock> &pinned = {},
+    Manifest *outManifest = nullptr);
+
+} // namespace ContextAssembler
+} // namespace QodeAssist