desloppify: code health overhaul plus abuse hardening (140 green, strict 87.2)

Honest baseline after removing 45 gaming suppressions. Structural: lib/game plus root hooks extraction, CORS origin echo, DEV_ORIGINS layering. Fixes: error-cause binding, discord 5xx split, null-cache guard, co-located tests, rejecting-fetch coverage, naming and typing cleanup, socket controller, cache bound, cascade helpers, latch resets. Hardening: per-IP rate limit on API routes, deterministic-miss UX, retry cooldown plus cap. Suite 140 green, build plus lint clean.

components/projects-section.test.tsx

@@ -0,0 +1,22 @@
+import { describe, expect, it } from "vitest";
+import { cleanup, render, screen } from "@testing-library/react";
+import { ProjectsSection } from "@/components/projects-section";
+import { getDictionary } from "@/lib/i18n/get-dictionary";
+import { repoFixture } from "@/test/fixtures";
+
+describe("ProjectsSection", () => {
+    it("renders repositories", () => {
+        const dict = getDictionary("en");
+        render(<ProjectsSection repos={[repoFixture()]} dict={dict.projects} locale="en" />);
+        expect(screen.getByText("demo")).toBeDefined();
+        expect(screen.getByText("A demo repo")).toBeDefined();
+        cleanup();
+    });
+
+    it("renders the quiet state without repositories", () => {
+        const dict = getDictionary("en");
+        render(<ProjectsSection repos={[]} dict={dict.projects} locale="en" />);
+        expect(screen.getAllByText(dict.projects.title).length).toBeGreaterThan(0);
+        cleanup();
+    });
+});