Render Markdig MathInline and MathBlock nodes

[Copilot]

UseAdvancedExtensions() enables Markdig's mathematics extension, which parses $...$ into MathInline and $$...$$ into MathBlock. Neither type had a registered ConsoleObjectRenderer, so all math content was silently dropped — leaving unexplained gaps in any document containing math.

Renderers

• ConsoleMathInlineRenderer (one-liner in ConsoleObjectRenderers.cs) wraps MathInline.Content with the DisplayOptions.MathInline style, mirroring ConsoleCodeInlineRenderer.
• ConsoleMathBlockRenderer (dedicated file) uses a fenced presentation like ConsoleCodeBlockRenderer, with DisplayOptions.MathBlock and an optional math label gated on ShowMathBlockLabel.

Registration order

MathBlock extends FencedCodeBlock, and Markdig's MarkdownObjectRenderer.Accept uses type assignability — so ConsoleMathBlockRenderer must precede ConsoleCodeBlockRenderer in the list, otherwise the code-block renderer would claim the type. A comment in ConsoleRenderer.cs records this.

DisplayOptions

New properties (with Clone() updates):

• MathInline, MathBlock — text styles (default green on purple to differentiate from CodeInLine/CodeBlock's yellow on blue).
• ShowMathBlockLabel (default false), MathBlockLabel, MathBlockLabelText ("math") — opt-in language-style label, analogous to ShowFencedCodeBlockInfo / FencedCodeBlockInfo.

Tests / fixtures

• New mathInline.md / .txt and mathBlock.md / .txt snapshot pairs.
• RendererTests_MathInlineTest and RendererTests_MathBlockTest with [DataRow] for default + crazy styles.
• m_crazyOptions extended with the new properties (incl. ShowMathBlockLabel = true).
• bracketEscaping.md extended with $[test30]…$ and $$[test31]…$$; bracketEscaping.txt regenerated.

Docs / example

• example.md: new ## Mathematics section and Mathematics TODO entry.
• CHANGELOG.md: entry under Upcoming Changes → Renderers.

internal class ConsoleMathInlineRenderer : ConsoleObjectRenderer<MathInline>
{
    protected override void Write(ConsoleRenderer renderer, MathInline obj)
        => renderer
            .AddInLine($"[{renderer.Options.MathInline.ToSpectreStyle().ToMarkup()}]")
            .WriteEscape(ref obj.Content)
            .AddInLine("[/]");
}

[boxofyellow]

@copilot please check out this comment.

[Copilot]

@copilot please check out this comment.

Addressed in 7b43580 — see reply on the inline thread.

[boxofyellow]

@copilot in 7b43580 you removed ShowMathBlockLabel and change the default value for label property, but the old value is still referenced in the PRs description.

[Copilot]

@copilot in 7b43580 you removed ShowMathBlockLabel and change the default value for label pro...

Updated the PR description — removed the ShowMathBlockLabel bullet and the "math" default, and noted the label is now gated on !string.IsNullOrEmpty(MathBlockLabelText) (default string.Empty).

[boxofyellow]

@copilot This PR need to be rebased (not just having master merged on top). However you will not have permission to forcepush changes.

Please checkout the main branch, create a new branch and then replay this PRs commits onto top of that new branch while addressing conflicts.

When you are done please let me know the name of the new branch you created.

[Copilot]

@copilot This PR need to be rebased (not just having master merged on top). However you will not have permission to forcepush changes.

Please checkout the main branch, create a new branch and then re...

Done. The rebased branch is copilot/markdig-consider-render-math-nodes-rebased (tip f370c11), branched from current main (5c986e4) with the two PR commits replayed.

Resolved conflicts:

• docs/CHANGELOG.md — kept both Renderers entries; math entry now references PR Render Markdig MathInline and MathBlock nodes #145.
• ObjectRenderers/ConsoleRenderer.cs — kept the new ConsoleAbbreviationInlineRenderer() from main alongside ConsoleMathBlockRenderer() (ordered before ConsoleCodeBlockRenderer).
• ConsoleMarkdownRenderer.Example/data/example.md — kept Abbreviations + Figures TODO items and added Mathematics.
• ConsoleMarkdownRenderer.Tests/resources/bracketEscaping.{md,txt} — renumbered the math identifiers to [test33] / [test34] since [test30]–[test32] are now used by the abbreviation/figure cases on main; regenerated the .txt accordingly.

All 167 unit tests (ConsoleMarkdownRenderer.Tests, net8.0) and 21 example tests pass.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.92%. Comparing base (4dc9fc6) to head (b6d867d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
+ Coverage   95.81%   95.92%   +0.11%     
==========================================
  Files          30       31       +1     
  Lines        1696     1743      +47     
  Branches      179      182       +3     
==========================================
+ Hits         1625     1672      +47     
  Misses         46       46              
  Partials       25       25              

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