feat(cases): Reddit Posts Explorer e MinGW GCC Installer com resposta, desafio, implementacao, limites e fontes fixadas em commit

- textos reescritos a partir do codigo e do README dos repositorios publicos (SHA ff76e08 e bab64fc); remove afirmacoes que o codigo nao sustenta (SSG, rate limiting/cache, busca em tempo real, download assincrono, monitoramento)
- public/portfolio-data.json alinhado (descricao, tecnologias, recursos e selos)
- testes: cinco cases detalhados, limite sourced + escopo editorial, guardas contra afirmacoes sem fonte

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

lib/site-content.test.ts

@@ -1,6 +1,12 @@
 import { caseStudies, getRelatedServices, servicePages } from "./site-content";
 
-const detailedIds = ["as-servicos", "nutriscan", "twins-lab"] as const;
+const detailedIds = [
+  "as-servicos",
+  "gcc-installer",
+  "nutriscan",
+  "reddit-explorer",
+  "twins-lab",
+] as const;
 const immutableGitHubBlobUrl =
   /^https:\/\/github\.com\/[^/]+\/[^/]+\/blob\/[0-9a-f]{40}\/.+$/;
 
@@ -11,7 +17,7 @@ function getDetail(id: (typeof detailedIds)[number]) {
   return detail;
 }
 
-it("limits detailed content to the three evidenced cases", () => {
+it("limits detailed content to the evidenced cases (public repositories pinned to a commit)", () => {
   expect(
     caseStudies
       .filter(({ detail }) => detail !== undefined)
@@ -64,6 +70,13 @@ it("requires sources for factual statements and resolves every source ID", () =>
   expect(getDetail("nutriscan").boundaries[0]?.sourceIds).toContain(
     "nutri-readme",
   );
+
+  // reddit-explorer e gcc-installer: o 1º limite vem da documentação do repositório; o 2º é o escopo editorial (sem fonte)
+  for (const id of ["reddit-explorer", "gcc-installer"] as const) {
+    const { boundaries } = getDetail(id);
+    expect(boundaries[0]?.sourceIds.length).toBeGreaterThan(0);
+    expect(boundaries.slice(1).every(({ sourceIds }) => sourceIds.length === 0)).toBe(true);
+  }
 });
 
 it("derives the exact related service set from the existing relationship", () => {