fix(make-pdf): single-source page numbers via CSS, honor --no-page-numbers end-to-end

Two page-number sources were stacking in every PDF: Chromium's native footer
and our @page @bottom-center CSS. The CLI flag --page-numbers/--no-page-numbers
also never reached the CSS layer, because RenderOptions didn't carry it.
Passing --footer-template likewise dropped the "custom footer replaces stock
footer" semantic.

- orchestrator.ts: browseClient.pdf() gets pageNumbers:false unconditionally.
  CSS is the single source of truth. Chromium native numbering always off.
- render.ts: RenderOptions gains pageNumbers + footerTemplate. render() computes
  showPageNumbers = pageNumbers !== false && !footerTemplate and passes to
  printCss(), preserving the prior footerTemplate-suppresses-stock semantic.
- print-css.ts: PrintCssOptions.pageNumbers wraps @bottom-center in a conditional
  matching the existing showConfidential pattern.
- types.ts: PreviewOptions.pageNumbers so preview path compiles and matches CLI.
- render.test.ts: 7 regression tests covering printCss({pageNumbers}) in
  isolation AND the full render() data flow incl. footerTemplate path.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

make-pdf/src/render.ts

@@ -34,6 +34,11 @@ export interface RenderOptions {
   // Page layout
   pageSize?: "letter" | "a4" | "legal" | "tabloid";
   margins?: string;
+
+  // Footer behavior. pageNumbers defaults to true. When footerTemplate is set,
+  // CSS page numbers are suppressed so the custom Chromium footer wins cleanly.
+  pageNumbers?: boolean;
+  footerTemplate?: string;
 }
 
 export interface RenderResult {
@@ -74,6 +79,10 @@ export function render(opts: RenderOptions): RenderResult {
   const derivedDate = opts.date ?? formatToday();
 
   // 5. Build CSS
+  // CSS is the single source of truth for page numbers (Chromium native
+  // numbering is always off in orchestrator). If the caller supplied a custom
+  // footerTemplate, suppress CSS page numbers too so their footer wins.
+  const showPageNumbers = opts.pageNumbers !== false && !opts.footerTemplate;
   const cssOptions: PrintCssOptions = {
     cover: opts.cover,
     toc: opts.toc,
@@ -83,6 +92,7 @@ export function render(opts: RenderOptions): RenderResult {
     runningHeader: derivedTitle,
     pageSize: opts.pageSize,
     margins: opts.margins,
+    pageNumbers: showPageNumbers,
   };
   const css = printCss(cssOptions);