Workflows: Add RimWorkflowVec3Binding for Vec3-typed config fields

Recognizes Vec3-shaped object schemas ({x, y, z} number properties)
structurally in RimWorkflowDescribeTools and dispatches them to a new
RimWorkflowVec3Binding in RimWorkflowTaskInput::createBinding(). Stores
the value as a cvf::Vec3d field, parses JSON object defaults, and emits
a YAML flow-mapping ({x: .., y: .., z: ..}) matching the taskmaestro
Vec3 pydantic model shape.

ApplicationLibCode/ProjectDataModel/Workflow/RimWorkflowVec3Binding.cpp

@@ -0,0 +1,53 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2026     Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+#include "RimWorkflowVec3Binding.h"
+
+#include <QJsonObject>
+
+CAF_PDM_SOURCE_INIT( RimWorkflowVec3Binding, "WorkflowVec3Binding" );
+
+RimWorkflowVec3Binding::RimWorkflowVec3Binding()
+{
+    CAF_PDM_InitField( &m_value, "Value", cvf::Vec3d::ZERO, "Value" );
+}
+
+void RimWorkflowVec3Binding::applySchema( const QJsonObject& fieldSchema )
+{
+    RimWorkflowFieldBinding::applySchema( fieldSchema );
+
+    // taskmaestro_resinsight.models.Vec3 is a plain pydantic model with x/y/z number fields, so its
+    // JSON representation (both the schema default and config_values) is an object, not an array.
+    const QJsonObject defaultObject = fieldSchema.value( "default" ).toObject();
+    if ( defaultObject.contains( "x" ) && defaultObject.contains( "y" ) && defaultObject.contains( "z" ) )
+    {
+        m_value =
+            cvf::Vec3d( defaultObject.value( "x" ).toDouble(), defaultObject.value( "y" ).toDouble(), defaultObject.value( "z" ).toDouble() );
+    }
+}
+
+QString RimWorkflowVec3Binding::toYamlValue() const
+{
+    if ( !hasValue() ) return "null";
+
+    const cvf::Vec3d& v = m_value();
+    return QString( "{x: %1, y: %2, z: %3}" )
+        .arg( QString::number( v.x(), 'g', 17 ) )
+        .arg( QString::number( v.y(), 'g', 17 ) )
+        .arg( QString::number( v.z(), 'g', 17 ) );
+}