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/test/render.test.ts

@@ -311,4 +311,46 @@ describe("printCss", () => {
     // Confirm no p-indent slipped in
     expect(css).not.toMatch(/p\s*\+\s*p\s*\{[^}]*text-indent/);
   });
+
+  test("emits @bottom-center page-number rule by default", () => {
+    const css = printCss();
+    expect(css).toMatch(/@bottom-center\s*\{\s*content:\s*counter\(page\)/);
+  });
+
+  test("suppresses @bottom-center page-number rule when pageNumbers=false", () => {
+    const css = printCss({ pageNumbers: false });
+    expect(css).not.toMatch(/@bottom-center\s*\{\s*content:\s*counter\(page\)/);
+  });
+
+  test("still emits @bottom-center when pageNumbers=true (explicit)", () => {
+    const css = printCss({ pageNumbers: true });
+    expect(css).toMatch(/@bottom-center\s*\{\s*content:\s*counter\(page\)/);
+  });
+});
+
+// ─── render() — pageNumbers / footerTemplate data flow ───────────────
+
+describe("render() — pageNumbers data flow", () => {
+  test("CSS footer renders by default", () => {
+    const result = render({ markdown: `# Doc\n\nBody.` });
+    expect(result.printCss).toMatch(/@bottom-center\s*\{\s*content:\s*counter\(page\)/);
+  });
+
+  test("--no-page-numbers reaches the CSS layer", () => {
+    const result = render({ markdown: `# Doc\n\nBody.`, pageNumbers: false });
+    expect(result.printCss).not.toMatch(/@bottom-center\s*\{\s*content:\s*counter\(page\)/);
+  });
+
+  test("footerTemplate suppresses CSS page numbers (custom footer wins)", () => {
+    const result = render({
+      markdown: `# Doc\n\nBody.`,
+      footerTemplate: `<div class="foo">custom</div>`,
+    });
+    expect(result.printCss).not.toMatch(/@bottom-center\s*\{\s*content:\s*counter\(page\)/);
+  });
+
+  test("pageNumbers=true + no footerTemplate keeps CSS footer", () => {
+    const result = render({ markdown: `# Doc`, pageNumbers: true });
+    expect(result.printCss).toMatch(/@bottom-center\s*\{\s*content:\s*counter\(page\)/);
+  });
 });