refactor(blog): unify use-case I/O schemas + presenter + feature error map

Per Plan 9 (spec R1-R28):
- Use cases: input + output schemas (getArticles, createArticle,
  getArticleBySlug). Output validated via outputSchema.parse before
  return. status field uses articleStatusSchema (was loose `string`).
- Controllers: receive `unknown`; safeParse with use-case schema;
  identity presenter (R11) on every controller.
- New integrations/api/procedures.ts with blogProcedure
  ([InputParseError → BAD_REQUEST], [ArticleNotFoundError → NOT_FOUND]).
- Router uses blogProcedure + .input(xInputSchema) for all 3 procedures.
- src/index.ts: remove articleBySlugQuery/listArticlesQuery re-exports;
  export schemas + types + IUseCase/IController aliases.
- src/ui/index.ts (NEW): query builders moved here; package.json adds
  ./ui subpath.
- New tests: R25 output-validation per use case; R26 router error-
  mapping (NOT_FOUND on missing slug, BAD_REQUEST on schema fail).

Refactor log: §1, §2, §3.1, §3.2, §3.3, §5.1, §5.2, §6.1, §6.2
Spec: R1–R6, R8–R15, R18–R20, R22–R26

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -1,24 +1,24 @@
-import { z } from "zod";
-
 import { InputParseError } from "../../entities/errors/common";
-import type { Article } from "../../entities/models/article";
-import type { IGetArticlesUseCase } from "../../application/use-cases/get-articles.use-case";
+import {
+  getArticlesInputSchema,
+  type GetArticlesOutput,
+  type IGetArticlesUseCase,
+} from "../../application/use-cases/get-articles.use-case";
 
-const inputSchema = z.object({
-  status: z.string().optional(),
-  authorId: z.string().optional(),
-  limit: z.number().optional(),
-  offset: z.number().optional(),
-});
+function presenter(value: GetArticlesOutput) {
+  // identity for now (R11 — every non-void controller has a presenter)
+  return value;
+}
 
 export type IGetArticlesController = ReturnType<typeof getArticlesController>;
 
 export const getArticlesController =
   (getArticlesUseCase: IGetArticlesUseCase) =>
-  async (input: Partial<z.infer<typeof inputSchema>>): Promise<Article[]> => {
-    const parsed = inputSchema.safeParse(input);
+  async (input: unknown): Promise<ReturnType<typeof presenter>> => {
+    const parsed = getArticlesInputSchema.safeParse(input);
     if (!parsed.success) {
       throw new InputParseError("Invalid get-articles input", { cause: parsed.error });
     }
-    return getArticlesUseCase(parsed.data);
+    const result = await getArticlesUseCase(parsed.data);
+    return presenter(result);
   };