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[TS] Execute parameter defaults in declaration order (#372) - #419
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Parameter defaults and destructuring now execute immediately after reading their own argument and before initializing the next parameter. Earlier bindings are available to later defaults, while self/forward temporal-dead-zone accesses raise ReferenceError. Capture scanning includes default initializers; the prologue callback also preserves the lexical receiver introduced by the preceding arrow MR. Closures over uninitialized parameters remain explicitly unsupported.
Validation: fresh typecheck and focused frontend tests (15 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 #372