chore: implement instruction retrieval during chat operation

BREAKING CHANGE: The predefined function operation needed to be changed.

Author: NickChecan

com.developer.nefarious.zjoule.plugin/META-INF/MANIFEST.MF

@@ -31,6 +31,7 @@ Export-Package:
  com.developer.nefarious.zjoule.plugin.core,
  com.developer.nefarious.zjoule.plugin.core.events,
  com.developer.nefarious.zjoule.plugin.core.functions,
+ com.developer.nefarious.zjoule.plugin.core.preferences,
  com.developer.nefarious.zjoule.plugin.core.ui,
  com.developer.nefarious.zjoule.plugin.core.utils,
  com.developer.nefarious.zjoule.plugin.login,

com.developer.nefarious.zjoule.plugin/src/com/developer/nefarious/zjoule/plugin/chat/ChatOrchestrator.java

@@ -4,6 +4,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import com.developer.nefarious.zjoule.plugin.core.preferences.Instruction;
 import com.developer.nefarious.zjoule.plugin.models.Role;
 
 /**

com.developer.nefarious.zjoule.plugin/src/com/developer/nefarious/zjoule/plugin/chat/Instruction.java

@@ -0,0 +1,32 @@
+package com.developer.nefarious.zjoule.plugin.core.preferences;
+
+import org.eclipse.jface.preference.IPreferenceStore;
+
+import com.developer.nefarious.zjoule.plugin.core.Activator;
+
+/**
+ * Provides system-level instructions for AI interactions.
+ * The {@code Instruction} class contains the operation to retrieve instructions 
+ * used to guide the AI's behavior and ensure responses adhere to best practices.
+ * This is a utility class and cannot be instantiated.
+ */
+public abstract class Instruction {
+	
+	public static String KEY = "instructions";
+
+    /**
+     * Retrieves the preferred system message text.
+     *
+     * @return the system message text as a {@link String}.
+     */
+    public static String getMessage() {
+    	IPreferenceStore store = Activator.getDefault().getPreferenceStore();
+        return store.getString(KEY);
+    }
+
+    /**
+     * Private constructor to prevent instantiation of this utility class.
+     */
+    private Instruction() { }
+
+}

com.developer.nefarious.zjoule.plugin/src/com/developer/nefarious/zjoule/plugin/core/preferences/Instruction.java

@@ -34,7 +34,7 @@ protected void createFieldEditors() {
         groupContent.setLayout(new GridLayout(1, false));
         groupContent.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
 
-        addField(new StringFieldEditor("instructions", "Instructions:", groupContent));
+        addField(new StringFieldEditor(Instruction.KEY, "Instructions:", groupContent));
 
 	}
 

com.developer.nefarious.zjoule.plugin/src/com/developer/nefarious/zjoule/plugin/core/preferences/PluginPreferencesPage.java

@@ -25,8 +25,8 @@
 import com.developer.nefarious.zjoule.plugin.chat.IAIClient;
 import com.developer.nefarious.zjoule.plugin.chat.IChatMessage;
 import com.developer.nefarious.zjoule.plugin.chat.IChatOrchestrator;
-import com.developer.nefarious.zjoule.plugin.chat.Instruction;
 import com.developer.nefarious.zjoule.plugin.chat.utils.EditorContentReader;
+import com.developer.nefarious.zjoule.plugin.core.preferences.Instruction;
 import com.developer.nefarious.zjoule.plugin.models.Role;
 
 public class ChatOrchestratorTest {