Research tree parsing and view

ResTreeLib/ResearchNodeData.cs

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+namespace ResTreeLib;
+
+public record ResearchNodeData
+{
+    public int Index { get; init; }
+    public Trf0Element Node { get; init; } = null!;
+    public NodeState State { get; init; } // From TRF1
+    public string ShortName { get; set; } = "";
+    public string LongName { get; init; } = "";
+    public string HelpText { get; set; } = "";
+    public string Description { get; init; } = "";
+    
+    /// <summary>
+    /// These IDs define what technologies a player must complete before the current node becomes available for research.
+    /// These are derived from TRF2 (which stores the count of parents) and TRF3 (which contains the flat list of parent IDs).
+    /// </summary>
+    /// <example>
+    /// If Flamethrower Mk II has PrerequisiteIds = [18], then the node with index 18 (Flamethrower Mk I) must be finished first.
+    /// </example>
+    public uint[] PrerequisiteIds { get; init; } = []; // From TRF2/3
+    
+    /// <summary>
+    /// These IDs define the immediate "downstream" effects or technologies that are triggered when the current research is finished.
+    /// These are derived from TRF4 (the count of unlocks) and TRF5 (the flat list of target IDs).
+    /// </summary>
+    public uint[] UnlockIds { get; init; } = [];       // From TRF4/5
+}