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

Per Plan 9 (spec R1-R28):
- getHeader use case: input z.object({}).strict() (R5); output =
  headerSchema parsed at runtime.
- getHeader controller: unknown input + identity presenter.
- New integrations/api/procedures.ts with navigationProcedure
  ([InputParseError → BAD_REQUEST], [HeaderNotFoundError → NOT_FOUND]).
- Router uses navigationProcedure + .input(getHeaderInputSchema).
- src/index.ts: remove headerQuery; export schemas + IUseCase/Controller
  aliases.
- src/ui/index.ts (NEW); package.json adds ./ui subpath.
- R25 + R26 tests added.

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

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

@@ -23,6 +23,8 @@ doc-update items so docs are written once for the post-Plan-9 state.
 - packages/blog/src/ui/index.ts — re-exports articleBySlugQuery and listArticlesQuery from ./query (moved from feature root index)
 - packages/marketing-pages/src/integrations/api/procedures.ts — marketingPagesProcedure with feature error map (InputParseError → BAD_REQUEST, PageNotFoundError → NOT_FOUND)
 - packages/marketing-pages/src/ui/index.ts — re-exports pageBySlugQuery and siteSettingsQuery from ./query (moved from feature root index)
+- packages/navigation/src/integrations/api/procedures.ts — navigationProcedure with feature error map (InputParseError → BAD_REQUEST, HeaderNotFoundError → NOT_FOUND)
+- packages/navigation/src/ui/index.ts — re-exports headerQuery from ./query (moved from feature root index)
 
 ## 2. Files modified
 
@@ -58,6 +60,12 @@ doc-update items so docs are written once for the post-Plan-9 state.
 - packages/marketing-pages/src/index.ts — removed pageBySlugQuery/siteSettingsQuery re-exports; added schemas + types + IUseCase/IController aliases
 - packages/marketing-pages/package.json — added ./ui subpath export
 - All affected marketing-pages use-case + controller tests updated for new contracts
+- packages/navigation/src/application/use-cases/get-header.use-case.ts — getHeaderInputSchema (z.object({}).strict()) + getHeaderOutputSchema (= headerSchema); _input parameter; output.parse; types exported
+- packages/navigation/src/interface-adapters/controllers/get-header.controller.ts — identity presenter; unknown input; imports getHeaderInputSchema from use-case; ReturnType<typeof presenter> return type
+- packages/navigation/src/integrations/api/router.ts — uses navigationProcedure + .input(getHeaderInputSchema); ctrl called with input
+- packages/navigation/src/index.ts — removed headerQuery re-export (moved to ./ui); exports getHeaderInputSchema, getHeaderOutputSchema, GetHeaderInput, GetHeaderOutput, IGetHeaderUseCase, IGetHeaderController; added HeaderNotFoundError + InputParseError re-exports
+- packages/navigation/package.json — added ./ui subpath export
+- packages/navigation/src/integrations/api/router.test.ts — updated to call caller.header({}); added R26 describe block; uses beforeEach/afterEach to rebind container
 
 ## 3. Pattern changes (code-level)
 
@@ -65,16 +73,19 @@ doc-update items so docs are written once for the post-Plan-9 state.
 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.
 marketing-pages migrated: both use cases. getPageBySlug exports getPageBySlugInputSchema + getPageBySlugOutputSchema + types; returns undefined for missing page (preserving existing semantics) — parse only called when page found. getSiteSettings exports getSiteSettingsInputSchema (z.object({}).strict() — void input per R5) + getSiteSettingsOutputSchema + types; takes `_input: GetSiteSettingsInput` to satisfy uniform input contract.
+navigation migrated: single use case (getHeader). Exports getHeaderInputSchema (z.object({}).strict() — void input per R5) + getHeaderOutputSchema (= headerSchema) + types; takes `_input: GetHeaderInput`; throws HeaderNotFoundError when repository returns falsy (existing behavior preserved); ends with `getHeaderOutputSchema.parse(header)`.
 
 ### 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.
 marketing-pages migrated: both controllers. getPageBySlug has identity presenter; return type is `ReturnType<typeof presenter> | undefined` (preserves missing-page semantics). getSiteSettings has identity presenter; return type is `ReturnType<typeof presenter>`. Both accept `unknown` input and safeparse with the imported use-case schema.
+navigation migrated: single controller (getHeaderController). Identity presenter; return type `ReturnType<typeof presenter>`. Accepts `unknown` input and safeparses with getHeaderInputSchema imported from use-case file.
 
 ### 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.
 marketing-pages migrated: marketingPagesProcedure in procedures.ts wraps defineErrorMiddleware with 2-tuple map (InputParseError → BAD_REQUEST, PageNotFoundError → NOT_FOUND). Router uses `marketingPagesProcedure.input(xInputSchema)` for both procedures. siteSettings now uses `.input(getSiteSettingsInputSchema)` (was a no-input `.query()`).
+navigation migrated: navigationProcedure in procedures.ts wraps defineErrorMiddleware with 2-tuple map (InputParseError → BAD_REQUEST, HeaderNotFoundError → NOT_FOUND). Router uses `navigationProcedure.input(getHeaderInputSchema)` (was a no-input `.query()` with publicProcedure).
 
 ## 4. Error-middleware adoption
 
@@ -89,11 +100,13 @@ marketing-pages migrated: marketingPagesProcedure in procedures.ts wraps defineE
 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.
 marketing-pages: `./ui` subpath added to package.json exports; `src/ui/index.ts` created re-exporting pageBySlugQuery and siteSettingsQuery from ./query.
+navigation: `./ui` subpath added to package.json exports; `src/ui/index.ts` created re-exporting headerQuery from ./query (moved from feature root index).
 
 ### 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.
 marketing-pages: root `src/index.ts` removed pageBySlugQuery/siteSettingsQuery re-exports (moved to ./ui); now exports getPageBySlugInputSchema/Output, getSiteSettingsInputSchema/Output, all XInput/XOutput types, IUseCase aliases, and IController aliases.
+navigation: root `src/index.ts` removed headerQuery re-export (moved to ./ui); now exports getHeaderInputSchema, getHeaderOutputSchema, GetHeaderInput, GetHeaderOutput, IGetHeaderUseCase, IGetHeaderController; also exports HeaderNotFoundError and InputParseError.
 
 ## 6. Test additions
 
@@ -101,11 +114,13 @@ marketing-pages: root `src/index.ts` removed pageBySlugQuery/siteSettingsQuery r
 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.
 marketing-pages: getPageBySlug has 1 R25 test verifying that a repository returning a malformed page object throws ZodError (instanceof). getSiteSettings has 1 R25 test using an inline malformed repository mock that returns `{ siteName: "" }` (fails min(1) constraint) to assert ZodError (instanceof).
+navigation: getHeader has 1 R25 test using an inline malformed repository mock that returns `{ items: [{ label: "", href: "/", external: false }] }` (label fails min(1) constraint) to assert ZodError (instanceof).
 
 ### 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).
 marketing-pages: 2 new R26 tests in router.test.ts — BAD_REQUEST on pageBySlug with empty input ({} as { slug: string }) (schema validation at tRPC procedure boundary); undefined return for missing slug confirmed (use case returns undefined rather than throwing PageNotFoundError, so NOT_FOUND mapping does not apply for this use case).
+navigation: 2 new R26 tests in router.test.ts — BAD_REQUEST on header with extra fields (strict() z.object({}) rejects unknown keys via InputParseError); NOT_FOUND on header when a NullHeaderRepository (inline @injectable class) causes HeaderNotFoundError (container rebound inline for the test).
 
 ### 6.3 R27/R28 — presenter shape tests