✨ feat(mq-lang): add spread operator for array and dict literals#1960
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Support `...expr` inside `[...]` and `{...}` literals, splicing an
array's elements or a dict's entries into the enclosing literal at
eval time. Adds lexer/parser/CST support, HIR lowering, type
inference in mq-check, formatter support, and LSP semantic tokens.
- Skip the spread-marker check for non-array/dict builtin calls, since `...expr` can only ever be parsed inside an array/dict literal. - Merge expand_spread's array/dict match arms to drop duplicated None/error handling. - Extract parse_dict's repeated comma/closing-brace tail logic (spread vs. key:value entries) into a shared parse_dict_separator helper.
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Close #1945