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* feat: presentation (.pptx) export (#1137) - Implement OpenXML PresentationML (.pptx) generator in crates/export/src/pptx.rs: - Generate [Content_Types].xml, _rels/.rels, core properties, presentation.xml - Build slide master, blank slide layout, and DrawingML theme - Render slides per page: largest text block as title shape, remaining paragraphs as body text box with font size, bold, italic, and color formatting - Embed images with proper DrawingML picture shapes and relationships - Generate DrawingML table shapes with column grid and span merging - Wire OfficeFormat::Pptx into crates/engine/src/compare.rs and export_office - Register export.pptx command and mark Presentation (.pptx) Ready in catalog - Support pptx in automation doc_export_office tool - Wire export.pptx into UI commands and file save dialog - Add unit and integration tests across crates/export, engine, automation, and ui-egui - Update create.export-pptx parity feature evidence and docs * pptx export: saturating slide positions, matching cell-border tags, theme ea/cs fonts, package test - Heights and the running vertical position use clamped/saturating arithmetic, so a hostile text size or image rectangle (1e300, NaN, inf) can't overflow i64; the item loop uses get(). - The table cells' a:lnR and a:lnT borders were closed with </a:lnL>, which made every slide with a table malformed XML; they now close with their own tags. - The theme's major/minor fonts carry the schema-required a:ea and a:cs children. - New test walks the produced zip entry by entry (sizes, inflation, central directory), checks every XML part's tags balance, the required parts, content-type overrides, relationship targets and that no placeholders are used; a hostile-sizes test covers the overflow. - Test literals gain main's Block/Image rotation and size fields. - Parity notes say what is still unverified. Co-Authored-By: Claude Opus 5.5 <[email protected]> --------- Co-authored-by: KrzysztofC <[email protected]> Co-authored-by: Brandon Thomas <[email protected]> Co-authored-by: Claude Opus 5.5 <[email protected]>