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

Per Plan 9 (spec R1-R28):
- Use cases: input + output schemas (getMedia, listMedia); deleteMedia
  has input schema only (void output, R12 — no presenter).
- Controllers: unknown input + identity presenter on getMedia/listMedia;
  Promise<void> on deleteMedia.
- New integrations/api/procedures.ts with mediaProcedure
  ([InputParseError → BAD_REQUEST], [MediaNotFoundError → NOT_FOUND]).
- Router uses mediaProcedure + .input(xInputSchema).
- src/index.ts exports schemas + types; src/ui/index.ts placeholder
  (media has no queries today); 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

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/media/src/index.ts

@@ -2,3 +2,29 @@ export type { Media } from "./entities/models/media";
 export { MediaNotFoundError } from "./entities/errors/media";
 export { InputParseError } from "./entities/errors/common";
 export type { MediaRouter } from "./integrations/api/router";
+
+// Use case schemas + types (Plan 9 R18)
+export {
+  getMediaInputSchema,
+  getMediaOutputSchema,
+  type GetMediaInput,
+  type GetMediaOutput,
+  type IGetMediaUseCase,
+} from "./application/use-cases/get-media.use-case";
+export {
+  listMediaInputSchema,
+  listMediaOutputSchema,
+  type ListMediaInput,
+  type ListMediaOutput,
+  type IListMediaUseCase,
+} from "./application/use-cases/list-media.use-case";
+export {
+  deleteMediaInputSchema,
+  type DeleteMediaInput,
+  type IDeleteMediaUseCase,
+} from "./application/use-cases/delete-media.use-case";
+
+// Controller type aliases
+export type { IGetMediaController } from "./interface-adapters/controllers/get-media.controller";
+export type { IListMediaController } from "./interface-adapters/controllers/list-media.controller";
+export type { IDeleteMediaController } from "./interface-adapters/controllers/delete-media.controller";