fix(examples): the engine deck stops calling a shipped backend planned (#510)

Its first page listed PPTX as "Planned" beside a version badge reading v2.1.0 —
the release that shipped it, and the release whose own copy of this deck is
published as a .pptx. Three more sentences dated from when PDF was the only
output: the library described as generating "structured business PDF documents",
the pipeline ending at "PDFBox writes the bytes", and page two headed "From one
Java file to a designed PDF".

PPTX is now the live @beta backend it is, ordered ahead of the semantic-only
DOCX export, and the prose covers both formats.

The layout baseline moves with it. The only structural change is the backend
cards reordering — Backend_PPTX shifts one position, the node count is
unchanged — plus the tagline growing from one line to two and the sections below
shifting by that height.

Author: DemchaAV

CHANGELOG.md

@@ -241,6 +241,14 @@ follow semantic versioning; release dates are ISO 8601.
 
 ### Documentation
 
+- **The engine deck stopped calling a shipped backend planned.** Its first page listed
+  PPTX as *Planned* beside a version badge reading v2.1.0 — the release that shipped it,
+  and the release whose own copy of that deck is published as a `.pptx`. The page also
+  described the library as generating "structured business PDF documents" and ended its
+  pipeline at "PDFBox writes the bytes", and page two was headed "From one Java file to
+  a designed PDF"; all three were written when PDF was the only output. PPTX is now the
+  live `@Beta` backend it is, ordered ahead of the semantic-only DOCX export, and the
+  prose covers both formats.
 - **The Maven Central banner became a deck.** It was one 16:9 slide: wordmark,
   coordinate, capability tags and a code → layout → document diagram. It now carries
   three more pages in the same amber-on-navy language — the authoring pipeline and what

assets/readme/examples/engine-deck.pdf

@@ -113,8 +113,8 @@ record Backend(String icon, String title, String sub, boolean live) {
     static List<Backend> backends() {
         return List.of(
                 new Backend("pdf-file", "PDFBox 3.0", "Production backend", true),
-                new Backend("docx", "DOCX export", "Semantic export", false),
-                new Backend("ppt-file", "PPTX", "Planned", false));
+                new Backend("ppt-file", "PPTX", "Editable deck · Beta", true),
+                new Backend("docx", "DOCX export", "Semantic export", false));
     }
 
     // ── "How it works" content (page 2) ───────────────────────────────────────
@@ -128,7 +128,7 @@ static List<PipelineStep> pipeline() {
                 new PipelineStep("1", "dsl", "AUTHOR", "Fluent DSL describes intent."),
                 new PipelineStep("2", "layout", "MEASURE", "Two-pass geometry, every node."),
                 new PipelineStep("3", "page-break", "PAGINATE", "Split the flow across pages."),
-                new PipelineStep("4", "pdf-file", "RENDER", "PDFBox writes the bytes."));
+                new PipelineStep("4", "pdf-file", "RENDER", "A backend writes the bytes."));
     }
 
     /** A "why it's solid" proof card: bold title + a sentence. */

examples/src/main/java/com/demcha/examples/flagships/EngineDeckData.java

@@ -260,7 +260,7 @@ static void compose(DocumentSession document) {
                     // ═════════ PAGE 2 — how it works ═════════
                     .addPageBreak(b -> b.name("ToHowItWorks"))
                     .addSection("HowKicker", s -> kicker(s, "HOW IT WORKS",
-                            "From one Java file to a designed PDF"))
+                            "From one Java file to a designed document"))
                     .addSection("HowBody", s -> s
                             .padding(DocumentInsets.zero())
                             .addParagraph(p -> p
@@ -273,7 +273,8 @@ static void compose(DocumentSession document) {
                                             .accent("paginates", VIOLET_DEEP)
                                             .plain(" the flow row-by-row, and ")
                                             .accent("renders", VIOLET_DEEP)
-                                            .plain(" through an isolated PDFBox backend. No manual coordinates, no XML templates."))
+                                            .plain(" the resolved layout through an isolated backend — PDFBox for PDF, "
+                                                    + "Apache POI for the deck. No manual coordinates, no XML templates."))
                                     .lineSpacing(1.55)))
                     .addRow("Pipeline", row -> {
                         row.spacing(8).weights(1, 0.14, 1, 0.14, 1, 0.14, 1);
@@ -375,7 +376,8 @@ private static void banner(SectionBuilder s) {
                 .add(brandLine())
                 .addParagraph(p -> p
                         .text("Open-source Java library for generating structured business "
-                                + "PDF documents with a declarative DSL.")
+                                + "documents with a declarative DSL — print-ready PDF and an "
+                                + "editable PowerPoint deck from one composition.")
                         .textStyle(tagline()).lineSpacing(1.3).margin(DocumentInsets.top(4)))
                 .addShape(sh -> sh.size(749, 1.2).fillColor(RULE_DARK).margin(DocumentInsets.top(8)))
                 .addRow("Flow", row -> {