Plain text: a captioned figure keeps its caption on its own line

[dereuromark]

Follow-up to #270, but a standalone bug that predates it: found while checking how a composite figure degrades to plain text, and reproducible on master with an ordinary captioned image.

PlainTextRenderer::renderNode() has no arm for Figure and none for Caption, so both fall through to default => $this->renderChildren($node).

Input:

![a](a.png)
^ Panel caption

Plain text on master:

aPanel caption

The alt text is glued straight onto the caption, with no separator and no trailing blank line, so nothing marks where the figure ends. Every other block in this renderer terminates with a blank line, and AnsiRenderer has had renderFigure() and renderCaption() all along - plain text was the only target missing them.

After:

a
Panel caption

Shape

renderFigure() renders each child on its own line, caption last, and terminates the block with one blank line like every neighbouring block method. renderCaption() returns the trimmed caption text with no terminator, so the caller owns the separators; the standalone arm only exists for a caption that somehow appears outside a figure.

The table path is untouched

A table caption never dispatches through renderNode() - renderTable() reads it off the node with getCaption() - so the new Caption arm cannot reach it. The existing table-caption test pins that output unchanged, which is what makes the claim checkable rather than merely stated.

Interaction with the composite-figure branch

#270 has a degradation test that asserts the current glued plain-text string. Whichever of the two lands second needs that assertion updated to the fixed output; #270 is a draft, so the simplest order is this one first and then a rebase there.

[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.41%. Comparing base (0379f22) to head (035a729).

Files with missing lines	Patch %	Lines
src/Renderer/PlainTextRenderer.php	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #271   +/-   ##
=========================================
  Coverage     92.41%   92.41%           
- Complexity     3674     3682    +8     
=========================================
  Files           109      109           
  Lines         10424    10440   +16     
=========================================
+ Hits           9633     9648   +15     
- Misses          791      792    +1     

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