docs(scripting): note that dot-completion walks the base chain for every receiver

Review m-5. The ctx.CancellationToken completion fix (d2cc0715) made
TryGetDotMembers include inherited instance members for EVERY receiver,
not only ctx. The visible side effect beyond the item's scope: struct
and enum receivers now also complete the System.ValueType / System.Enum
instance members they inherit (CompareTo, HasFlag, ...). These are
valid, compilable members, so the change is kept. This commit records
it here and in the code comment.

Refs #731 #734
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/ScriptAnalysis/ScriptAnalysisService.cs

@@ -271,7 +271,9 @@ public sealed class ScriptAnalysisService
         // The type's own members, then the INSTANCE members it inherits (stopping before System.Object, whose
         // ToString/GetHashCode noise was never offered). Without the base chain, a member declared only on
         // ScriptContext — ctx.CancellationToken — compiled and published but never completed. Inherited statics
-        // (ScriptContext.Deadband) are left out: they are not reachable through an instance receiver.
+        // (ScriptContext.Deadband) are left out: they are not reachable through an instance receiver. This applies to
+        // EVERY receiver, not only ctx: a struct or enum receiver now also offers the System.ValueType /
+        // System.Enum instance members it inherits (CompareTo, HasFlag, ...), all of which compile.
         var inherited = new List<ISymbol>();
         for (var b = type.BaseType; b is not null && b.SpecialType != SpecialType.System_Object; b = b.BaseType)
             inherited.AddRange(b.GetMembers().Where(m => !m.IsStatic));