Feature/bex use case completeness#3

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feature/bex-use-case-completeness

May 23, 2026

Commits on May 23, 2026

Enhance `$forEach` with `key` and `index` bindings, add `$exists` operator, and improve `$resultValue` materialization
piotr-blue
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Add unit tests for `$forEach`, `$exists`, `$resultValue`, and rich fixtures
piotr-blue
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