[Repo Assist] perf+feat: optimize exists/contains; add TaskSeq.distinct/distinctBy/distinctByAsync#305

dsyme merged 3 commits intomainfsprojects/FSharp.Control.TaskSeq:mainfrom

repo-assist/perf-exists-distinct-2026-03-ae5d2085b24d632ffsprojects/FSharp.Control.TaskSeq:repo-assist/perf-exists-distinct-2026-03-ae5d2085b24d632fCopy head branch name to clipboard