[Repo Assist] fix: Markdown.ToMd preserves [body][key] form for unresolved indirect links

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Summary

Fixes an inconsistency in Markdown.ToMd where unresolved indirect links were serialised as broken direct links [body](key) instead of the correct indirect form [body][key].

Root Cause

In MarkdownUtils.fs, formatSpan had a combined case for IndirectLink:

| IndirectLink(body, _, LookupKey ctx.Links (link, _), _)
| IndirectLink(body, link, _, _) -> "[" + formatSpans ctx body + "](" + link + ")"

When the reference key was not in ctx.Links, the second pattern matched with link bound to the original field — the raw reference text, not a URL. This produced [body](original) which treats the reference key as a URL, breaking the link.

Compare with IndirectImage, which already handled this correctly:

| IndirectImage(body, _, LookupKey ctx.Links (link, _), _) -> sprintf "![%s](%s)" body link
| IndirectImage(body, _, key, _) -> sprintf "![%s][%s]" body key  // ← preserves indirect form

Fix

Split the two IndirectLink cases to match the IndirectImage pattern:

| IndirectLink(body, _, LookupKey ctx.Links (link, _), _) -> "[" + formatSpans ctx body + "](" + link + ")"
| IndirectLink(body, _, key, _) -> "[" + formatSpans ctx body + "][" + key + "]"

Resolved links still produce a direct link (downconversion); unresolved links now preserve the [body][key] indirect form.

Changes

• src/FSharp.Formatting.Markdown/MarkdownUtils.fs — fix IndirectLink fallback case
• tests/FSharp.Markdown.Tests/Markdown.fs — add test ToMd preserves indirect link form when key is unresolved
• RELEASE_NOTES.md — changelog entry under [Unreleased] → Fixed

Test Status

✅ dotnet build FSharp.Formatting.sln --configuration Release — 0 errors, 0 warnings
✅ dotnet test tests/FSharp.Markdown.Tests --configuration Release --no-build — 347/347 passed (includes new test)

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