[Repo Assist] feat: add TaskSeq.tryMax and TaskSeq.tryMin

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Summary

Adds TaskSeq.tryMax and TaskSeq.tryMin — safe, option-returning variants of TaskSeq.max and TaskSeq.min that return None instead of raising ArgumentException when the input sequence is empty.

Motivation

TaskSeq.max and TaskSeq.min throw ArgumentException on empty sequences (matching Seq.max/Seq.min behaviour). A try-prefixed variant follows the established pattern in this library (tryHead, tryLast, tryExactlyOne, tryItem, tryFind, tryPick, ...) and mirrors F# 8's Seq.tryMax/Seq.tryMin.

Implementation

• TaskSeqInternal.fs: adds tryMaxMin helper — same loop as maxMin but uses MoveNextAsync() directly for the first element, returning Some acc or None instead of raising
• TaskSeq.fs: two one-liners delegating to Internal.tryMaxMin
• TaskSeq.fsi: XML-documented signatures for tryMax and tryMin
• TaskSeq.MaxMin.Tests.fs: 10 new tests in a TryMaxMin module covering null, empty variants, singleton, immutable variants (via TestImmTaskSeq), agreement with max/min, and side-effect re-iteration

Test Status

Build succeeded.    0 Warning(s)    0 Error(s)

Passed! - Failed: 0, Passed: 5430, Skipped: 2, Total: 5432

Formatting verified clean (dotnet fantomas . --check exit 0).

Closes nothing — this is a new API addition.

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