Render Markdig Figure and FigureCaption blocks

[Copilot]

Markdig's UseFigures() extension (enabled via UseAdvancedExtensions()) parses ^^^-delimited figure blocks into Figure / FigureCaption AST nodes, but no renderers were registered for them, so figures and their captions were silently dropped.

Changes

• Renderers (ObjectRenderers/ConsoleObjectRenderers.cs):
  • ConsoleFigureRenderer — wraps children in a Style.Plain frame (mirrors ConsoleCustomContainerRenderer / ConsoleQuoteBlockRenderer).
  • ConsoleFigureCaptionRenderer — writes inline content wrapped in the new FigureCaption style.
• Registration: Both added alphabetically in ConsoleRenderer ahead of ConsoleContainerInlineRenderer.
• DisplayOptions.FigureCaption: new TextStyle defaulting to Italic; cloned in Clone().
• Tests: new figure.md / figure.txt pair, RendererTests_FigureCaptionTest (default + useCrazy), m_crazyOptions extended, bracketEscaping resources extended with [test30]–[test32] covering caption text, bold inside captions, and image alt text inside figures.
• Docs: new ## Figures section in example.md; changelog entry under Upcoming Changes › Renderers.

internal class ConsoleFigureCaptionRenderer : ConsoleObjectRenderer<FigureCaption>
{
    protected override void Write(ConsoleRenderer renderer, FigureCaption obj)
        => renderer
            .StartInline()
            .AddInLine($"[{renderer.Options.FigureCaption.ToSpectreStyle().ToMarkup()}]")
            .WriteLeafInline(obj)
            .AddInLine("[/]")
            .EndInline();
}

Rendered output for ^^^ caption\n![sample](url)\n^^^:

┌───────────────────────────────────────────┐
│ ┌───────────────────────────────────────┐ │
│ │ A descriptive caption for the figure. │ │
│ │ ![sample](http://example.com/img.png) │ │
│ └───────────────────────────────────────┘ │
└───────────────────────────────────────────┘

[boxofyellow]

@copilot please checkout these comments.

[boxofyellow]

@copilot Please rebase (not merge in master) this PR and address conflicts.

[Copilot]

@copilot Please rebase (not merge in master) this PR and address conflicts.

I attempted the rebase locally (rebased cleanly onto 42efafd, resolved the conflicts with #141 in docs/CHANGELOG.md, ConsoleMarkdownRenderer.Example/data/example.md, and ConsoleMarkdownRenderer.Tests/resources/bracketEscaping.{md,txt} — renumbering my bracket test markers to [test32]–[test34] since #141 took [test30]–[test31] — and all 158 tests passed), but my push tooling only supports fast-forward pushes and rejected the rebased history with non-fast-forward. I don't have the ability to git push --force / --force-with-lease from this environment, so I can't complete the rebase on the remote. Could you either force-push the rebased branch yourself, or grant the agent permission to force-push so I can retry?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.82%. Comparing base (42efafd) to head (fed8a46).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
+ Coverage   95.78%   95.82%   +0.03%     
==========================================
  Files          30       30              
  Lines        1662     1676      +14     
  Branches      176      176              
==========================================
+ Hits         1592     1606      +14     
  Misses         46       46              
  Partials       24       24              

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