fix: KF6Attica recipe, kf6-knewstuff Attica dep, topo-sort cycle error

- Created kf6-attica recipe (minimal core library build providing
  KF6::Attica cmake target, needed by kf6-knewstuff). v6.10.0,
  QML/tests/examples disabled.
- Added kf6-attica to redbear-full.toml config, integrate-redbear.sh
  symlink, and recipes/kde/ symlink.
- Fixed kf6-knewstuff: removed stale find_package(KF6Attica)
  suppression; added kf6-attica as dependency. Now publishes
  to repo (core-only build produces empty package — upstream
  code structure yields no libs with QtQuick/widgets/tools off).
- Cookbook topo-sort: changed cycle fallback from silent
  Ok(recipes) to Err(Recursion) — surfaces dependency graph
  bugs instead of hiding them.
- Fixed stale QtNetwork comment: QtNetwork IS enabled in qtbase
  since 2026-04-29 (relibc DNS resolver hardened).
- Verified: kf6-attica builds, kf6-knewstuff publishes to repo

local/recipes/kde/kf6-attica/source/src/topic.cpp

@@ -0,0 +1,123 @@
+/*
+    This file is part of KDE.
+
+    SPDX-FileCopyrightText: 2011 Laszlo Papp <djszapi@archlinux.us>
+
+    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+*/
+
+#include "topic.h"
+
+using namespace Attica;
+
+class Q_DECL_HIDDEN Topic::Private : public QSharedData
+{
+public:
+    QString m_id;
+    QString m_forumId;
+    QString m_user;
+    QDateTime m_date;
+    QString m_subject;
+    QString m_content;
+    int m_comments;
+
+    Private()
+        : m_comments(0)
+    {
+    }
+};
+
+Topic::Topic()
+    : d(new Private)
+{
+}
+
+Topic::Topic(const Topic &other)
+    : d(other.d)
+{
+}
+
+Topic &Topic::operator=(const Topic &other)
+{
+    d = other.d;
+    return *this;
+}
+
+Topic::~Topic()
+{
+}
+
+void Topic::setId(const QString &id)
+{
+    d->m_id = id;
+}
+
+QString Topic::id() const
+{
+    return d->m_id;
+}
+
+void Topic::setForumId(const QString &forumId)
+{
+    d->m_forumId = forumId;
+}
+
+QString Topic::forumId() const
+{
+    return d->m_forumId;
+}
+
+void Topic::setUser(const QString &user)
+{
+    d->m_user = user;
+}
+
+QString Topic::user() const
+{
+    return d->m_user;
+}
+
+void Topic::setDate(const QDateTime &date)
+{
+    d->m_date = date;
+}
+
+QDateTime Topic::date() const
+{
+    return d->m_date;
+}
+
+void Topic::setSubject(const QString &subject)
+{
+    d->m_subject = subject;
+}
+
+QString Topic::subject() const
+{
+    return d->m_subject;
+}
+
+void Topic::setContent(const QString &content)
+{
+    d->m_content = content;
+}
+
+QString Topic::content() const
+{
+    return d->m_content;
+}
+
+void Topic::setComments(const int comments)
+{
+    d->m_comments = comments;
+}
+
+int Topic::comments() const
+{
+    return d->m_comments;
+}
+
+bool Topic::isValid() const
+{
+    return !(d->m_id.isEmpty());
+}