avoid quadratic group value recomputation in TokenList#848
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group_tokens and TokenList.init recompute a group's value by deep-flattening its whole subtree, so grouping an N-element identifier list is O(N^2): a 4000-column SELECT (~23 KB, under the 10000-token cap) takes ~1.8s to parse. Build the value from the direct children's already-current values and append only the newly added tokens on extend. Linear time, byte-identical parse output, full test suite passes.