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[TS] Lower class expressions as constructor values - #407
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A class expression currently becomes UnsupportedValue. Register its synthetic class, emit a fresh NewClassExpr constructor value, and preserve constructor and instance-field initialization. Heritage, named self-binding, static/computed members and lexical captures remain explicitly unsupported.
Validation: fresh typecheck and focused frontend tests (30 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 #388