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>

docs/superpowers/refactor-logs/2026-05-06-input-output-unification.md

@@ -19,6 +19,8 @@ doc-update items so docs are written once for the post-Plan-9 state.
 - packages/core-shared/src/trpc/define-error-middleware.test.ts — 4 tests covering mapped translation, multiple codes, unmapped passthrough (verifies INTERNAL_SERVER_ERROR + cause preservation), cause preservation
 - packages/auth/src/integrations/api/procedures.ts — authProcedure with feature error map (InputParse → BAD_REQUEST, Auth/Unauthenticated → UNAUTHORIZED, Unauthorized → FORBIDDEN)
 - packages/auth/src/ui/index.ts — placeholder UI surface (no queries today; mutations only)
+- packages/blog/src/integrations/api/procedures.ts — blogProcedure with feature error map (InputParseError → BAD_REQUEST, ArticleNotFoundError → NOT_FOUND)
+- packages/blog/src/ui/index.ts — re-exports articleBySlugQuery and listArticlesQuery from ./query (moved from feature root index)
 
 ## 2. Files modified
 
@@ -36,17 +38,30 @@ doc-update items so docs are written once for the post-Plan-9 state.
 - packages/auth/package.json — added ./ui subpath
 - packages/auth/tests/sign-in-flow.feature.test.ts — updated to match new presenter shapes (cookie return, void sign-out, object input)
 - All affected auth use-case + controller tests updated for new contracts
+- packages/blog/src/application/use-cases/get-articles.use-case.ts — getArticlesInputSchema + getArticlesOutputSchema; status narrowed to articleStatusSchema; output.parse; types exported
+- packages/blog/src/application/use-cases/create-article.use-case.ts — createArticleInputSchema + createArticleOutputSchema; output.parse; types exported
+- packages/blog/src/application/use-cases/get-article-by-slug.use-case.ts — getArticleBySlugInputSchema + getArticleBySlugOutputSchema; output.parse; types exported
+- packages/blog/src/interface-adapters/controllers/get-articles.controller.ts — identity presenter; unknown input; imports getArticlesInputSchema from use-case
+- packages/blog/src/interface-adapters/controllers/create-article.controller.ts — identity presenter; unknown input; imports createArticleInputSchema from use-case
+- packages/blog/src/interface-adapters/controllers/get-article-by-slug.controller.ts — identity presenter; unknown input; imports getArticleBySlugInputSchema from use-case
+- packages/blog/src/integrations/api/router.ts — uses blogProcedure + .input(xInputSchema) for all 3 procedures
+- packages/blog/src/index.ts — removed articleBySlugQuery/listArticlesQuery re-exports; added schemas + types + IUseCase/IController aliases
+- packages/blog/package.json — added ./ui subpath export
+- All affected blog use-case + controller tests updated for new contracts
 
 ## 3. Pattern changes (code-level)
 
 ### 3.1 Use-case files — input + output schemas + runtime parse
 auth migrated: all 3 use cases. signIn and signUp export xInputSchema + xOutputSchema + types; signOut exports xInputSchema only (void output). All non-void use cases end with `xOutputSchema.parse(result)` before returning.
+blog migrated: all 3 use cases. getArticles, createArticle, getArticleBySlug each export xInputSchema + xOutputSchema + XInput + XOutput types. getArticlesInputSchema narrows status to articleStatusSchema (not loose string). All 3 end with `xOutputSchema.parse(result)` before returning.
 
 ### 3.2 Controller files — presenter + unknown input + view return type
 auth migrated: all 3 controllers. signIn/signUp have `function presenter(value: XOutput)` returning `value.cookie`; return type is `ReturnType<typeof presenter>`. signOut has no presenter (void). All controllers accept `unknown` input and safeparse with the use-case schema.
+blog migrated: all 3 controllers. All 3 (getArticles, createArticle, getArticleBySlug) have `function presenter(value: XOutput)` that is identity (`return value`); return type is `ReturnType<typeof presenter>`. All accept `unknown` input and safeparse with the imported use-case schema.
 
 ### 3.3 tRPC integration — feature-scoped procedures, schema reuse from use cases
 auth migrated: authProcedure in procedures.ts wraps defineErrorMiddleware with 4-tuple error map. Router uses `authProcedure.input(xInputSchema)` for all 3 procedures — no more local schema redefinition.
+blog migrated: blogProcedure in procedures.ts wraps defineErrorMiddleware with 2-tuple map (InputParseError → BAD_REQUEST, ArticleNotFoundError → NOT_FOUND). Router uses `blogProcedure.input(xInputSchema)` for all 3 procedures.
 
 ## 4. Error-middleware adoption
 
@@ -59,17 +74,21 @@ auth migrated: authProcedure in procedures.ts wraps defineErrorMiddleware with 4
 
 ### 5.1 ./ui subpath added per feature
 auth: `./ui` subpath added to package.json exports; `src/ui/index.ts` placeholder created (auth has no query builders — all procedures are mutations).
+blog: `./ui` subpath added to package.json exports; `src/ui/index.ts` created re-exporting articleBySlugQuery and listArticlesQuery from ./query.
 
 ### 5.2 Feature root index.ts cleanup
 auth: root `src/index.ts` now exports all use-case schemas (signInInputSchema, signInOutputSchema, signUpInputSchema, signUpOutputSchema, signOutInputSchema) and types (SignInInput/Output, SignUpInput/Output, SignOutInput, ISignInUseCase, ISignUpUseCase, ISignOutUseCase) plus controller type aliases.
+blog: root `src/index.ts` removed articleBySlugQuery/listArticlesQuery re-exports (moved to ./ui); now exports getArticlesInputSchema/Output, createArticleInputSchema/Output, getArticleBySlugInputSchema/Output, all XInput/XOutput types, IUseCase aliases, and IController aliases.
 
 ## 6. Test additions
 
 ### 6.1 R25 — output-validation tests (use case)
 auth: signIn and signUp each have 2 new R25 tests — one verifying that a malformed service response throws (Zod parse error), one verifying the output schema parses a valid shape. signOut is void — no R25 test.
+blog: getArticles, createArticle, getArticleBySlug each have 2 new R25 tests — one verifying that a repository returning a malformed object throws ZodError (instanceof), one verifying the output schema parses a valid shape.
 
 ### 6.2 R26 — router error-mapping tests
 auth: 2 new R26 tests in router.test.ts — UNAUTHORIZED on missing user (AuthenticationError translation), BAD_REQUEST on Zod schema failure (schema validation at procedure boundary).
+blog: 2 new R26 tests in router.test.ts — NOT_FOUND on articleBySlug with missing slug (ArticleNotFoundError translation via blogProcedure), BAD_REQUEST on articleBySlug with empty input ({} as { slug: string }) (schema validation at tRPC procedure boundary).
 
 ### 6.3 R27/R28 — presenter shape tests