Ship Windows 1.0.0 and drop Linux from the download page

- release-links: bump to 1.0.0; Windows now points at AgentCompany-1.0.0-x64.exe
  (signed x64 NSIS, uploaded to R2); remove the Linux platform. macOS stays on
  0.4.182 until the 1.0.0 mac build is ready.
- platform-support / product-narrative / footer / layout / faq: remove Linux
  from availability copy, the FAQ, JSON-LD, and footer download links
- e2e: adjust the tracked-download-link count (macOS x2 + Windows = 3)

landing/tests/e2e/landing.spec.ts

@@ -41,7 +41,7 @@ test("download links use the tracked endpoint and never expose R2 URLs", async (
   await scrollThrough(page);
 
   const tracked = page.locator('#download a[href^="/api/download?asset="]');
-  expect(await tracked.count()).toBeGreaterThanOrEqual(9);
+  expect(await tracked.count()).toBeGreaterThanOrEqual(3);
 
   // Real release URLs must stay behind the server-side redirect.
   expect(await page.locator('a[href*="r2.dev"]').count()).toBe(0);