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fix: avoid excessive Draft recursion for readonly arrays in recursive types (#1311)

WritableDraft only took the `Draft<T[number]>[]` shortcut for mutable
arrays, so readonly arrays went through the mapped type and recursive
types such as type-fest's JsonValue (which uses `readonly JsonValue[]`)
still hit TS2589. Match `readonly any[]` so readonly plain arrays take
the same path.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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