feat: Add SortedVecMap and SortedVecSet#67
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Introduces BTreeMap/BTreeSet-style counterparts to VecMap/VecSet that keep entries sorted by key. Lookups and inserts use binary search; iteration follows sort order. - New SortedKeyedVecSet backing type in src/sorted_keyed/ (sibling of keyed/), reusing the Keyed trait. - SortedVecMap in src/sorted_map/ with Entry API (VacantEntry remembers the binary-search insertion index to avoid a second search), Range and RangeMut iterators, BTreeMap-style first_key_value/last_key_value/ pop_first/pop_last, binary_search_* and partition_point helpers. - SortedVecSet in src/sorted_set/ with a Range iterator and the usual union/intersection/difference/symmetric_difference. - Bounds: K: Ord for key-dependent operations; borrowed-lookup queries use Q: Ord + ?Sized. - No insert_at, swap_remove*, swap_indices, reverse, sort_*, or MutableKeys since these would fight the sort invariant. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Introduces BTreeMap/BTreeSet-style counterparts to VecMap/VecSet that keep entries sorted by key. Lookups and inserts use binary search; iteration follows sort order.