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[TS] Evaluate computed object-literal property keys - #405
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Computed object keys currently collapse to a placeholder. Emit ToPropertyKeyExpr, generic PropertyRef and ordered data-property definitions, evaluating the key once before the value and preserving the receiver before key coercion. This PR contains the object-key contracts and lowering, without getters, spread copies or destructuring rest.
Validation: fresh typecheck and focused frontend tests (4 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 #374