Add ISO A4 PDF print/book pipeline, page-frame prompts, and usage docs

Print and book PDF modes now letterbox each raster to A4 portrait at pdf.density;
print uses the matte color for pads. CLI forces 3:4 generation for print|book unless
--aspect-ratio is set. Cover, gallery, and back prompts gain DINA4PDF instructions when
those modes are active.

Introduce DescribePageFrame and PDF helpers with tests; add CLI tests for presentation
and aspect precedence. Expand README and config example with A4 examples, language
env vars, and page-format vs PDF behavior. Add sample Sumer vocabulary files.

Made-with: Cursor

5 files changed, 11 insertions, 6 deletions

diff --git a/prompts/back_cover_prompt.md b/prompts/back_cover_prompt.md
index 6242bff..90d3b5d 100644
--- a/prompts/back_cover_prompt.md
+++ b/prompts/back_cover_prompt.md
@@ -1,8 +1,9 @@
 This comic is in {{.LanguageName}}. All visible back-cover text, banners, boxes, and labels must use {{.ScriptName}} script only.
 
 Style: {{.Style}}.{{.RenderingRequirement}}
-Full back cover {{if .RenderingRequirement}}photographic scene{{else}}illustration{{end}} in landscape 16:9 format.
-No panel grid. No speech bubbles.
+Full back cover {{if .RenderingRequirement}}photographic scene{{else}}illustration{{end}} in {{.PageFrame}}.
+{{if .DINA4PDF}}This file is one ISO A4–class portrait page in the final PDF: use a single unified composition that fills the entire canvas edge to edge (one sheet only — no collage of multiple pages, no inset spreads, no “photo of several sheets” staging).
+{{end}}No panel grid. No speech bubbles.
 {{if .Bible}}CHARACTER AND SETTING REFERENCE:
 {{.Bible}}
 
diff --git a/prompts/cover_prompt.md b/prompts/cover_prompt.md
index f268498..8bd14d6 100644
--- a/prompts/cover_prompt.md
+++ b/prompts/cover_prompt.md
@@ -1,8 +1,9 @@
 This comic is in {{.LanguageName}}. All visible cover text, including the main title, must use {{.ScriptName}} script only.
 
 Style: {{.Style}}.{{.RenderingRequirement}}
-Full front cover {{if .RenderingRequirement}}photographic scene{{else}}illustration{{end}} in landscape 16:9 format.
-No panel grid. No speech bubbles.
+Full front cover {{if .RenderingRequirement}}photographic scene{{else}}illustration{{end}} in {{.PageFrame}}.
+{{if .DINA4PDF}}This file is one ISO A4–class portrait page in the final PDF: use a single unified composition that fills the entire canvas edge to edge (one sheet only — no collage of multiple pages, no inset spreads, no “photo of several sheets” staging).
+{{end}}No panel grid. No speech bubbles.
 {{if .Bible}}CHARACTER AND SETTING REFERENCE:
 {{.Bible}}
 
diff --git a/prompts/gallery_page_prompt.md b/prompts/gallery_page_prompt.md
index 4cdbd04..9068bce 100644
--- a/prompts/gallery_page_prompt.md
+++ b/prompts/gallery_page_prompt.md
@@ -9,8 +9,9 @@ VARIETY REQUIREMENTS:
   • This gallery image should feel like a distinct portfolio shot from a different moment in the story world.
 
 Style: {{.Style}}.{{.RenderingRequirement}}
-One full-frame {{if .RenderingRequirement}}photograph that looks 100% like a real camera shot{{else}}illustration{{end}} in landscape 16:9 format.
-Do not split the image into panels or sections. The entire canvas is one single scene.
+One full-frame {{if .RenderingRequirement}}photograph that looks 100% like a real camera shot{{else}}illustration{{end}} in {{.PageFrame}}.
+{{if .DINA4PDF}}This file is one ISO A4–class portrait page in the final PDF: one continuous scene must fill the whole canvas edge to edge (never multiple physical sheets, comic spreads, or stacked pages in-frame).
+{{end}}Do not split the image into panels or sections. The entire canvas is one single scene.
 No text of any kind. No title, labels, speech bubbles, panel borders, or UI elements.
 {{if .Bible}}CHARACTER AND SETTING REFERENCE:
 {{.Bible}}
diff --git a/prompts/manual_prompt.md b/prompts/manual_prompt.md
index 177bfca..cebee78 100644
--- a/prompts/manual_prompt.md
+++ b/prompts/manual_prompt.md
@@ -2,6 +2,7 @@ Create a single image based on this prompt:
 
 {{.Prompt}}
 
+Target page shape: {{.PageFrame}}.
 {{if .Style}}Visual style: {{.Style}}.
 {{end}}{{if .Theme}}Theme context: {{.Theme}}.
 {{end}}{{if .RenderingRequirement}}{{.RenderingRequirement}}
diff --git a/prompts/story_page_prompt.md b/prompts/story_page_prompt.md
index dd2e452..93bc33a 100644
--- a/prompts/story_page_prompt.md
+++ b/prompts/story_page_prompt.md
@@ -1,4 +1,5 @@
 This comic page is in {{.LanguageName}}. All speech, thoughts, captions, and labels inside panels must use {{.ScriptName}} script only.
+Page dimensions: {{.PageFrame}}.
 
 UNIQUE STORY PAGE {{.PageNum}} OF {{.TotalPages}} — render this page as a NEW story beat, not a repeat of any previous page.
 The exact page-specific panel plan is the highest priority instruction: