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* Depend on craft-pdf (krilla writer, reader for tests) at craft-libs 9f75d3dc The root patches pin the patched krilla and hayro-syntax/hayro-jbig2 to the same revision, as craft-pdf requires. * Plot PDFs with craft-pdf's krilla writer The hand-written object, xref, stream and font writer goes. Each sheet's display list is built, written as its page and dropped before the next. Strokes with the same colour, width and transparency stay one path, and each filled primitive is one path of its triangles. Text in embeddable TrueType fonts is drawn as glyphs; krilla subsets the fonts and writes their ToUnicode maps, so the hand-written subsetter goes too and cadcraft-fonts keeps only the fsType embedding check. Primitives with a point that is not finite or beyond 1e7 pt are left out. A font krilla cannot embed after all makes the export retry with text as outlines. Optional content (PDF layers) is not written until craft-libs' writer supports it: the layer transitions go through one empty function, layers that are off are not plotted, and the layer tests are ignored. The tests read the PDF back with craft-pdf's reader. * Pin craft-pdf and its krilla and hayro patches to craft-libs cd160e73 cd160e73 adds optional content groups to the patched krilla. * Write drawing layers as PDF optional content groups Each drawing layer a page draws on gets one group, named after the layer and shared by all pages, created before the first page that uses it. A group starts hidden when its layer is off in the drawing, so `offLayers` again plots layers that are off on hidden PDF layers. At most 4096 groups per file; objects on further layers print unmarked. A single sheet with groups opens with the viewer's layer panel (/PageMode /UseOC). Layer changes end and start the marked content, and the last mark ends before the page finishes. The layer and text tests that check the groups run again, and a test covers the group cap. * Plot a zero-length line as a round dot in PDFs krilla leaves out a path without extent, so a lone zero-length line drew nothing. It is filled as the dot its round-capped stroke would make, as wide as the stroke, with 0.25 pt for a hairline. * PDF: retry as outlines when the writer fails inside a font; cap layer names; restore two test checks * Tests: read plotted PDFs back through the shared reader in plot_layout_scale and plot_styles * Pin craft-pdf, krilla, hayro-syntax and hayro-jbig2 to craft-libs main (7895f5e) * PDF tests: read path coordinates in page space; cover the font retry and out-of-range points - pdf_read maps path operands through the CTM (`page_ops`, used by `drawn` and `clip_rect`) and checks that the plot area is drawn in page space. - The 1:1 layout test finds the viewport corner at (72, 72) in page space, so a mirrored page fails it. - A font with a short hmtx passes the writer's font checks but fails subsetting; the plot retries and draws its text as outlines. - A primitive with a point past 1e7 pt is left out, and the rest still plots. * PDF: clip a primitive with a far vertex to the plot area instead of leaving it out A polyline or fill with a point past the writer's f32 range now keeps the parts inside the plot area (polylines with the area widened by the stroke width), each piece its own subpath. Primitives in range are written as before. The test reader requires a decodable content stream.