StoneCypher / jssm / fd6fdd6297006ddb36df993103077fe44da00b34

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fix: render text labels in CLI raster (PNG/JPEG) output

The CLI's Node rasterization path produced images with shapes and
arrows but every text label blank. @resvg/resvg-wasm ships no fonts and
cannot read OS-installed fonts from inside its wasm sandbox, so it
rasterized the SVG with no font available and silently dropped every
<text> element.

rasterize.ts now discovers fonts from the host OS's standard font
directories and passes them to resvg via font.fontBuffers, falling back
to an embedded Ubuntu Sans subset when the host has no usable fonts
(minimal containers, stripped CI images). Discovery is bounded to a
small byte budget because resvg re-parses every supplied font on each
render.

Reported in #615.

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