Move release manifest into lib/ to fix dependency direction

Architecture review (hai-architecture / APoSD) of the shipped redesign found one
structural smell: the shared lib/ layer imported the release manifest from
components/ — data in the presentation layer, dependency pointing the wrong way.
- move components/release-links.generated.ts -> lib/; update the four importers
  and the README. lib/ no longer imports from components/.
- downloads.ts: reuse PlatformDownload["id"] instead of re-declaring the union.

No behavior change (download counter + tracked hrefs identical); build + e2e 12/12.

landing/components/release-links.generated.ts

@@ -1,59 +0,0 @@
-export type PlatformDownloadAsset = {
-  architectures: ReleaseArchitecture[];
-  id: string;
-  label: string;
-  href: string;
-  note: string;
-};
-
-export type ReleaseArchitecture = "arm64" | "x64" | "x86";
-
-export type PlatformDownload = {
-  id: "macos" | "windows" | "linux";
-  packageDescription: string;
-  title: string;
-  note: string;
-  assets: PlatformDownloadAsset[];
-};
-
-export const releaseVersion = "1.0.0";
-
-export const platformDownloads: PlatformDownload[] = [
-  {
-    id: "macos",
-    packageDescription: "signed and notarized DMG builds",
-    title: "macOS",
-    note: "Signed + notarized DMG builds",
-    assets: [
-      {
-        architectures: ["arm64"],
-        id: "macos-arm64-dmg",
-        label: "Apple Silicon DMG",
-        href: "https://pub-a19a3a2c1d2e4fa3a9c120b184024448.r2.dev/AC/AgentCompany-0.4.182-arm64.dmg",
-        note: "arm64",
-      },
-      {
-        architectures: ["x64"],
-        id: "macos-x64-dmg",
-        label: "Intel Mac DMG",
-        href: "https://pub-a19a3a2c1d2e4fa3a9c120b184024448.r2.dev/AC/AgentCompany-0.4.182.dmg",
-        note: "x64",
-      },
-    ],
-  },
-  {
-    id: "windows",
-    packageDescription: "a signed NSIS installer build",
-    title: "Windows",
-    note: "Signed NSIS installer build",
-    assets: [
-      {
-        architectures: ["x64"],
-        id: "windows-x64-installer",
-        label: "Windows Installer (x64)",
-        href: "https://pub-a19a3a2c1d2e4fa3a9c120b184024448.r2.dev/AC/AgentCompany-1.0.0-x64.exe",
-        note: "x64",
-      },
-    ],
-  },
-];

landing/components/sections/download-section.tsx

@@ -5,7 +5,7 @@ import { Download } from "reicon-react/icons/Download";
 import { Container } from "../ui/container";
 import { Reveal } from "../ui/reveal";
 import { SectionHeading } from "../ui/section-heading";
-import { platformDownloads, releaseVersion } from "../release-links.generated";
+import { platformDownloads, releaseVersion } from "../../lib/release-links.generated";
 import { DOWNLOAD_COUNT_SEED, getTrackedDownloadHref } from "../../lib/downloads";
 
 export function DownloadSection() {