[Repo Assist] feat: add TaskSeq.rev, sort, sortDescending, sortBy/Async, sortByDescending/Async, sortWith (101 tests)

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Summary

Implements the sort/rev family of functions that were previously marked ❓ in the README with note #1 (requiring pre-materialisation before streaming).

Function	Description
TaskSeq.rev	Reverses the sequence (materialise, reverse, stream back)
TaskSeq.sort	Ascending natural-comparison sort
TaskSeq.sortDescending	Descending natural-comparison sort
TaskSeq.sortBy	Ascending sort by synchronous projection
TaskSeq.sortByAsync	Ascending sort by asynchronous projection
TaskSeq.sortByDescending	Descending sort by synchronous projection
TaskSeq.sortByDescendingAsync	Descending sort by asynchronous projection
TaskSeq.sortWith	Sort using a custom comparison function

Design

All functions follow the same pattern:

1. Materialise the full source sequence into a ResizeArray via the existing toResizeArrayAsync helper
2. Apply the corresponding Array.* sort primitive (returns a new sorted array — non-mutating)
3. Yield elements back as a TaskSeq

The async projection variants (sortByAsync/sortByDescendingAsync) additionally await each key computation sequentially before sorting.

Memory note: All these functions hold the entire sequence in memory. This is consistent with how Seq.sort, Seq.rev, etc. work in FSharp.Core — and is explicitly documented in XML doc comments and the README.

Test Status

✅ All tests pass — 3,897 tests pass (2 skipped as usual), including 101 new sort/rev tests.

New tests cover:

• Null argument guard (each function)
• Empty sequence variants (each function)
• Single-element sequences
• Multi-element sequences with integers, strings, tuples
• Async key projection variants using Task.FromResult
• Invariants: rev ∘ rev = id, sortByDescending = rev ∘ sortBy, sync/async parity
• Custom comparers in sortWith

Build and formatting (Fantomas) both pass.

Changes

• TaskSeqInternal.fs — implementations of all 8 functions
• TaskSeq.fs — static member wrappers
• TaskSeq.fsi — XML-doc'd signatures with correct type constraints
• TaskSeq.Sort.Tests.fs — 101 new tests (new file)
• FSharp.Control.TaskSeq.Test.fsproj — adds Sort test file
• README.md — marks sort/rev as ✅ implemented
• release-notes.txt — adds entry under v0.5.0

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[dsyme]

Let's not do these, they aren't very useful