[Martin Brekhof (MBrekhof)]

Problem

1. Nested ChildResults error messages are never formatted:
   RulesEngine.ExecuteAllRulesAsync only runs FormatErrorMessages on top-level RuleResultTree items where !result.IsSuccess. Any failed child rules inside result.ChildResults retain literal $(Property) placeholders in ChildResults[*].ExceptionMessage.

2. Object graph cycles throw JsonException during error formatting:
   When IgnoreException is false (default) and an input object has a bidirectional navigation property (e.g., EF Core parent/child entities), JsonSerializer.Serialize(input.Value) inside FormatErrorMessages throws System.Text.Json.JsonException: A possible object cycle was detected.

Solution

• Recurse into result.ChildResults when formatting error messages on failed rule trees.
• Pass JsonSerializerOptions { ReferenceHandler = ReferenceHandler.IgnoreCycles } to JsonSerializer.Serialize in FormatErrorMessages.
• Added unit tests in test/RulesEngine.UnitTest/FormatErrorMessagesNestedAndCyclesTest.cs.

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