docs: add a family dependency diagram to the README

Author: Mearman

README.md

@@ -6,6 +6,35 @@
 
 `document-cli` adds no conversion or editing logic of its own — it is a dispatch layer over `documents.js`'s existing conversion functions, `DocumentConverter` port, live-view editors, and `.odb`/PDF readers. What it adds is two ways to drive them without writing TypeScript: a scriptable, Unix-shaped CLI (stdin/stdout, exit codes, `--json` diagnostics) for pipelines, and a full-screen Ink terminal app for browsing and editing a document interactively.
 
+```mermaid
+graph TD
+    schema("document-schema.js")
+    ooxml("ooxml.js")
+    odf("odf.js")
+    pdfcodec("pdf-codec")
+    documents("documents.js")
+    cli("document-cli")
+
+    schema --> ooxml
+    schema --> odf
+    schema --> pdfcodec
+    schema --> documents
+    ooxml --> documents
+    odf --> documents
+    pdfcodec --> documents
+    documents --> cli
+    odf --> cli
+
+    click schema "https://github.com/ExaDev/document-schema.js" "document-schema.js"
+    click ooxml "https://github.com/ExaDev/ooxml.js" "ooxml.js"
+    click odf "https://github.com/ExaDev/odf.js" "odf.js"
+    click pdfcodec "https://github.com/ExaDev/pdf-codec" "pdf-codec"
+    click documents "https://github.com/ExaDev/documents.js" "documents.js"
+    click cli "https://github.com/ExaDev/document-cli" "document-cli"
+
+    style cli fill:#f9a825,stroke:#333,stroke-width:3px
+```
+
 ## Why
 
 `documents.js` is a library, not a tool — everything it does happens through function calls from TypeScript/JavaScript. Most people who want to convert a docx to a PDF, extract an `.odb` table to CSV, or poke at a PDF's structure from a terminal don't want to write a script to do it. `document-cli` is that missing entry point: every one of documents.js's 19 direct conversion pairs, its generic converter, its `.odm`/`.odb` extraction functions, and its PDF inspector become a single command-line invocation, and its six live-view editors (docx/pptx/odt/odp/ods/odg) become a keyboard-driven terminal app that never needs a code editor open at all.