feat: add support code completion via acp

sources/completion/AgenticCompletionEngine.hpp

@@ -0,0 +1,61 @@
+// 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 "completion/CompletionEngine.hpp"
+#include "context/IDocumentReader.hpp"
+#include "logger/IRequestPerformanceLogger.hpp"
+#include "providers/IProviderRegistry.hpp"
+#include "settings/CodeCompletionSettings.hpp"
+#include "settings/GeneralSettings.hpp"
+#include "templates/IPromptProvider.hpp"
+#include "tools/ProposeCompletionTool.hpp"
+
+namespace QodeAssist {
+
+class AgenticCompletionEngine : public CompletionEngine
+{
+    Q_OBJECT
+
+public:
+    AgenticCompletionEngine(
+        const Settings::GeneralSettings &generalSettings,
+        const Settings::CodeCompletionSettings &completeSettings,
+        Providers::IProviderRegistry &providerRegistry,
+        Templates::IPromptProvider *promptProvider,
+        Context::IDocumentReader &documentReader,
+        IRequestPerformanceLogger &performanceLogger,
+        QObject *parent = nullptr);
+    ~AgenticCompletionEngine() override;
+
+    void request(quint64 requestId, const CompletionContext &context) override;
+    void cancel(quint64 requestId) override;
+
+private slots:
+    void handleCompletionProposed(
+        const QString &filePath, int line, int column, const QString &text);
+    void handleFullResponse(const ::LLMQore::RequestID &requestId, const QString &fullText);
+    void handleRequestFailed(const ::LLMQore::RequestID &requestId, const QString &error);
+
+private:
+    struct ActiveRequest
+    {
+        quint64 requestId = 0;
+        QString filePath;
+        Providers::Provider *provider = nullptr;
+    };
+
+    const Settings::GeneralSettings &m_generalSettings;
+    const Settings::CodeCompletionSettings &m_completeSettings;
+    Providers::IProviderRegistry &m_providerRegistry;
+    Templates::IPromptProvider *m_promptProvider = nullptr;
+    Context::IDocumentReader &m_documentReader;
+    IRequestPerformanceLogger &m_performanceLogger;
+    QHash<::LLMQore::RequestID, ActiveRequest> m_activeRequests;
+};
+
+} // namespace QodeAssist