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refactor: use [] literal instead of Array::new() in two non-test sites

In bench/types.mbt and env/env_wasm.mbt, replace `Array::new()` (capacity-less
form) with the empty array literal `[]`. Type inference picks up the
expected type from the surrounding struct field / function return type, so
no annotation is needed.

The wider codebase already prefers `[]` for empty-array initialization
(see e.g. argparse/command.mbt, json/json.mbt, env/env_native.mbt).

Semantics-preserving: `moon test -p bench` (12/12) and
`moon test -p env` (100/100) pass; `moon info` produces no `.mbti` change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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