[Repo Assist] refactor: extract formatListBlock helper — eliminate ordered/unordered list duplication in MarkdownUtils.fs

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Summary

Task 5 (Coding Improvements): the formatParagraph function in MarkdownUtils.fs had two near-identical blocks for formatting ordered and unordered lists — differing only in the item prefix ("* " vs "1. ", "2. ", ...). This PR extracts a shared formatListBlock helper, reducing ~48 lines to ~27 lines with no semantic change.

Before

| ListBlock(Unordered, paragraphsl, _) ->
    let isTight = paragraphsl |> List.forall (function | [ Span _ ] -> true | _ -> false)
    for paragraphs in paragraphsl do
        for (i, paragraph) in List.indexed paragraphs do
            let lines = formatParagraph ctx paragraph
            let lines = if lines.IsEmpty then [ "" ] else lines
            for (j, line) in List.indexed lines do
                if i = 0 && j = 0 then yield "* " + line
                else yield "  " + line
        if not isTight then yield ""
    if isTight then yield ""

| ListBlock(Ordered, paragraphsl, _) ->
    // ... 20 lines identical except for "$"{n+1}. "" prefix ...

After

let formatListBlock paragraphsl (getPrefix: int -> string) = ...   // shared helper

| ListBlock(Unordered, paragraphsl, _) -> yield! formatListBlock paragraphsl (fun _ -> "* ")
| ListBlock(Ordered, paragraphsl, _)   -> yield! formatListBlock paragraphsl (fun n -> $"{n + 1}. ")

Changes

File	Change
src/FSharp.Formatting.Markdown/MarkdownUtils.fs	Extract formatListBlock helper, remove ~21 duplicate lines
RELEASE_NOTES.md	Changelog entry under [Unreleased]

Test Status

• ✅ dotnet build src/FSharp.Formatting.Markdown/FSharp.Formatting.Markdown.fsproj --configuration Release — 0 warnings, 0 errors
• ✅ dotnet test tests/FSharp.Markdown.Tests — 346/346 passed (includes existing list round-trip tests)
• ✅ dotnet fantomas src/FSharp.Formatting.Markdown/MarkdownUtils.fs --check — formatting verified

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