style(blog): add section dividers + drop redundant presenter comment

Code-quality reviewer flagged stylistic divergence from auth's pattern:
- All 3 blog use cases now have // ── Input ──... / ── Output ──... /
  ── Use case ──... section dividers (consistent with auth Task 3 + plan
  template §4.1).
- Removed inline comment in get-articles controller's presenter that
  appeared in only 1 of 3 controllers; identity presenters are
  self-explanatory.

packages/blog/src/application/use-cases/create-article.use-case.ts

@@ -3,6 +3,7 @@ import { z } from "zod";
 import { articleSchema } from "../../entities/models/article";
 import type { IArticlesRepository } from "../repositories/articles.repository.interface";
 
+// ── Input ────────────────────────────────────────────────────────────────
 export const createArticleInputSchema = z
   .object({
     title: z.string().min(1).max(255),
@@ -13,9 +14,11 @@ export const createArticleInputSchema = z
   .strict();
 export type CreateArticleInput = z.infer<typeof createArticleInputSchema>;
 
+// ── Output ───────────────────────────────────────────────────────────────
 export const createArticleOutputSchema = articleSchema;
 export type CreateArticleOutput = z.infer<typeof createArticleOutputSchema>;
 
+// ── Use case ─────────────────────────────────────────────────────────────
 function generateSlug(title: string): string {
   return title
     .toLowerCase()

packages/blog/src/application/use-cases/get-article-by-slug.use-case.ts

@@ -4,14 +4,17 @@ import { ArticleNotFoundError } from "../../entities/errors/article";
 import { articleSchema } from "../../entities/models/article";
 import type { IArticlesRepository } from "../repositories/articles.repository.interface";
 
+// ── Input ────────────────────────────────────────────────────────────────
 export const getArticleBySlugInputSchema = z
   .object({ slug: z.string().min(1) })
   .strict();
 export type GetArticleBySlugInput = z.infer<typeof getArticleBySlugInputSchema>;
 
+// ── Output ───────────────────────────────────────────────────────────────
 export const getArticleBySlugOutputSchema = articleSchema;
 export type GetArticleBySlugOutput = z.infer<typeof getArticleBySlugOutputSchema>;
 
+// ── Use case ─────────────────────────────────────────────────────────────
 export type IGetArticleBySlugUseCase = ReturnType<typeof getArticleBySlugUseCase>;
 
 export const getArticleBySlugUseCase =

packages/blog/src/application/use-cases/get-articles.use-case.ts

@@ -3,6 +3,7 @@ import { z } from "zod";
 import { articleSchema, articleStatusSchema } from "../../entities/models/article";
 import type { IArticlesRepository } from "../repositories/articles.repository.interface";
 
+// ── Input ────────────────────────────────────────────────────────────────
 export const getArticlesInputSchema = z
   .object({
     status: articleStatusSchema.optional(),
@@ -13,9 +14,11 @@ export const getArticlesInputSchema = z
   .strict();
 export type GetArticlesInput = z.infer<typeof getArticlesInputSchema>;
 
+// ── Output ───────────────────────────────────────────────────────────────
 export const getArticlesOutputSchema = z.array(articleSchema);
 export type GetArticlesOutput = z.infer<typeof getArticlesOutputSchema>;
 
+// ── Use case ─────────────────────────────────────────────────────────────
 export type IGetArticlesUseCase = ReturnType<typeof getArticlesUseCase>;
 
 export const getArticlesUseCase =

packages/blog/src/interface-adapters/controllers/get-articles.controller.ts

@@ -6,7 +6,6 @@ import {
 } from "../../application/use-cases/get-articles.use-case";
 
 function presenter(value: GetArticlesOutput) {
-  // identity for now (R11 — every non-void controller has a presenter)
   return value;
 }