v0.10.0

Highlights

Simplified the user-facing Document API so document metadata, page geometry, page overlays, units, and renderer theme options all live under DocumentSettings.
Updated renderers, examples, and documentation to use document.settings.theme, document.settings.cover_page, document.settings.subtitle, and related settings fields internally and in public examples.
Moved page-positioned overlays to DocumentSettings(page_items=[...]), keeping Document(...) focused on title, body content, citations, validation, and rendering.
Renamed the simple file-property author setting to metadata_author so it is distinct from structured visible authors.
Added document validation and source validation workflows, including structured compatibility results that can be printed as readable tables.
Added CLI entry points for build, convert, and validate workflows.
Added theorem-like countable blocks such as Definition, Lemma, Theorem, Proof, Example, Remark, and Assumption, plus a countable_kind(...) helper for custom counters.
Added Markdown heading-level controls and a release-note digest example that imports versioned Markdown files into a generated document.
Expanded the usage guide and example documents with generated bitmap diagrams and refreshed rendered examples.

Removed direct Document proxies for settings values such as document.author, document.summary, document.subtitle, document.authors, document.cover_page, document.unit, document.theme, and document-level geometry helpers.
Removed the Document(..., page_items=[...]) constructor shortcut. Use Document(..., settings=DocumentSettings(page_items=[...])) instead.
Renamed DocumentSettings(author=...) to DocumentSettings(metadata_author=...).
This is a minor release because backward compatibility is not preserved.

Table cells now default to left-aligned text across DOCX, PDF, and HTML so narrow cells do not inherit document-level justified paragraph spacing.
PDF, DOCX, and HTML rendering now handle more reference targets, caption/reference label customization, slight table, code, and highlight spacing, inline chips, vertical spacing, and footnote indexing more consistently across output formats.