feat: add product-aware deletion emails and subdomain deletion/downloads routes

- Extend DeletionForm with product discriminator and configurable cooldown cookie
- Extract env-free deletion email helpers into deletion-email.ts with Lineage/Nessa branding
- Make misc.sendDeletionRequestEmail mutation product-aware (subject, html content, cookie)
- Replace legacy /deletion/life-and-lineage page with 308 redirect to lineage subdomain
- Add Lineage and Nessa subdomain deletion route modules with shared content components
- Add Lineage downloads route modules with shared content
- Update privacy policy deletion link to lineage subdomain

src/routes/deletion/life-and-lineage.test.ts

@@ -0,0 +1,46 @@
+/**
+ * Regression test for the legacy `/deletion/life-and-lineage` route (task 11).
+ *
+ * The route was converted from a rendered page into a 308 permanent redirect
+ * to `lineage.freno.me/deletion`. Because the route file is a SolidStart
+ * server module, this is a STATIC SOURCE AUDIT (same pattern as the
+ * `misc.test.ts` regression tests) asserting:
+ *  - The route exports a `GET` handler (API-route redirect, not a page).
+ *  - The response status is 308 (permanent).
+ *  - The `Location` header derives from the centralized
+ *    `LEGACY_DELETION_REDIRECT_TARGET` constant (not a hardcoded literal), so
+ *    the unit test in `deletion-content.test.ts` is the single source of
+ *    truth for the destination.
+ *  - No page component / DeletionForm import remains (the form moved to
+ *    `src/routes/lineage/deletion.tsx`).
+ */
+import { describe, it, expect } from "bun:test";
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+
+const SOURCE = readFileSync(
+  join(import.meta.dir, "life-and-lineage.tsx"),
+  "utf8"
+);
+
+describe("Legacy /deletion/life-and-lineage — redirect (task 11)", () => {
+  it("is a GET handler (API-route redirect, not a rendered page)", () => {
+    expect(SOURCE).toContain("export function GET()");
+    expect(SOURCE).not.toContain("export default function");
+  });
+
+  it("responds with a 308 permanent redirect", () => {
+    expect(SOURCE).toContain("status: 308");
+  });
+
+  it("derives the Location from the centralized constant", () => {
+    expect(SOURCE).toContain("LEGACY_DELETION_REDIRECT_TARGET");
+    // The constant is imported from the lineage deletion-content module.
+    expect(SOURCE).toContain("~/routes/lineage/deletion-content");
+  });
+
+  it("no longer ships a page component / DeletionForm", () => {
+    expect(SOURCE).not.toContain("DeletionForm");
+    expect(SOURCE).not.toContain("PageHead");
+  });
+});