v0.8.0

Feature release — full theme() parity with R ggplot2.

New: theme() parity (epic #51)

Every common R theme() customization now works, in both the library and the CLI --theme-config:

• element_line(linetype) — dashed/dotted gridlines & lines (#46)
• element_text(face) — bold / italic titles/labels (bundled DejaVu Bold+Oblique) (#47)
• theme text hjust — align title/subtitle/caption/axis titles (#48)
• inheritance — root text element cascades family/color to all text (#49)
• aspect.ratio, axis.minor.ticks, panel.ontop, plot.title.position, plot.tag.position, legend.direction (#50)

Also

• CLI --theme-config (TOML/JSON) covers all of the above plus --palette and --primary.

Bundles DejaVuSans-Bold.ttf and DejaVuSans-Oblique.ttf (same DejaVu license) for headless bold/italic rendering.

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