v1.9.0 — Curated themes

Curated themes — the last open roadmap post (Track D item 6 / Track C). A theme is a colour palette plus a heading/body font pairing, applied across a document through a new --theme flag. Themes are code data — one source of truth — not a static styles.xml gallery that drifts.

Added

• odf_lib/themes.py — a theme registry with five curated themes: corporate-blue, warm-editorial, high-contrast, slate-mono, forest. Each is a palette + heading/body font pairing. get_theme() and theme_font_faces() join the published library API.
• --theme NAME on all five generators — create_minimal_odt, create_from_markdown, create_minimal_odp, create_minimal_ods, create_minimal_odg. The flag is purely additive: without it, every generator's output is byte-identical to before.

Changed

• The generators now declare fonts (office:font-face-decls + style:font-name) for the first time. Themes name fonts as CSS-style stacks ending in a Liberation fallback, so a themed document renders deterministically even where the first-choice font is absent.
• create_minimal_ods gains a light themed touch — a themed header-row cell style plus a table-cell default style for the body font.

Full changelog: CHANGELOG.md

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