[parallel] Fix hpx::nth_element to correctly support C++20 projections and sentinels#7191

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aneek22112007-tech wants to merge 18 commits intoTheHPXProject:masterfrom

aneek22112007-tech:fix/nth-element-projections-sentinels

Commits on Apr 16, 2026

Commits on Apr 18, 2026

Refine element_type deduction to handle HPX proxies using proxy_value_t
dasaneek007-cpu
committed

Commits on Apr 19, 2026

Remove redundant typename keywords as requested by maintainer
dasaneek007-cpu
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Restore typename keywords (strictly required for CI builds)
dasaneek007-cpu
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Separate core fix into independent PR and restore temporary workaround
dasaneek007-cpu
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