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[TS] Lower array spread with the iterator protocol (#370) - #417
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Array literals with spread now consume the selected iterator into a dynamically sized array instead of assuming the source length. Lowering evaluates the source once, caches next, preserves its receiver, checks iterator-result objects, and drains the iterator before evaluating the following literal element.
Validation: fresh typecheck and focused frontend tests (5 passed) on the exact rewritten head. The complete semantic stack at original #425 also passed the frontend build and 622 tests. Rebase preserved the original source tree exactly. Frontend/JSON/model correctness does not establish downstream USVM execution support.
Fixes #370