fix(examples): make the api-block demo endpoint actually type-check

directory.ts previously exported a plain (ctx: Context) => ... handler.
With that shape ApiInput<> resolved to unknown, so the generated
__wrn_api_check assertion for the demo page passed trivially even with
a field the endpoint does not accept -- the worked example did not
demonstrate the type safety it exists to demonstrate.

Rewrite directory.ts to use defineEndpoint with a schema (matching
typed-user.ts), which gives the generated assertion a real input type
to check against. Confirmed: adding an unaccepted field to the block's
request body now fails typecheck naming
__wrn_api_check_searchDirectory; removing it passes with zero net
diff.

Fix a real bug this surfaced: packages/core/src/endpoint.ts only read
its input from a second 'rawInput' argument, but the actual HTTP
router (packages/dev-server/src/runtime.ts handleApi) invokes route
handlers as handler(ctx) with no second argument. Every
defineEndpoint-based route -- including the pre-existing typed-user.ts
example -- silently received an empty/undefined input through the
real router (confirmed via curl: valid typed-user payloads were
rejected as 'Required'; directory's name filter matched every record
regardless of query). Fixed by having the endpoint wrapper parse the
request itself (query params for GET/HEAD, JSON body otherwise) when
no rawInput is explicitly supplied, while still honoring an explicit
rawInput for direct/unit-test callers.

Also update api-block-demo.wrn's response section: defineEndpoint
wraps handler output as { data: ... }, so the block's raw response
body is now { data: { users: [...] } } -- response reads
data.data.users instead of data.users.

Re-verified in a real browser after the endpoint rewrite and the
router fix: search returns exactly "Ajay, Asha", exactly one
POST /api/directory carrying x-csrf-token, and the error section
still runs cleanly (no exception, empty result) on a missing route.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

examples/basic-app/app/api/directory.ts

@@ -1,14 +1,27 @@
 import { defineEndpoint } from "@wrnexus/core";
-import type { Context } from "@wrnexus/core";
+import { SearchDirectorySchema } from "../schemas/search-directory.ts";
 
-const ALL = [
+interface DirectoryUser {
+  name: string;
+  designation: string;
+}
+
+const ALL: DirectoryUser[] = [
   { name: "Ajay", designation: "UI" },
   { name: "Asha", designation: "Backend" },
   { name: "Chen", designation: "UI" },
 ];
 
-export const POST = async (ctx: Context) => {
-  const body = (await ctx.req.json().catch(() => ({}))) as { name?: string };
-  const needle = String(body.name ?? "").toLowerCase();
-  return Response.json({ users: ALL.filter((user) => user.name.toLowerCase().includes(needle)) });
-};
+/**
+ * Schema-typed handler: input resolves to `{ name?: string }` from
+ * SearchDirectorySchema, so the block's request shape is checked for real
+ * (not against `unknown`, which the untyped-handler shape resolved to).
+ */
+export const POST = defineEndpoint<{ name?: string }, { users: DirectoryUser[] }>({
+  input: SearchDirectorySchema,
+  description: "Case-insensitive substring search over the demo directory by name.",
+  handler(input) {
+    const needle = String(input.name ?? "").toLowerCase();
+    return { users: ALL.filter((user) => user.name.toLowerCase().includes(needle)) };
+  },
+});

examples/basic-app/app/pages/api-block-demo.wrn

@@ -12,7 +12,7 @@ page ApiBlockDemo {
       }
 
       response {
-        return data.users
+        return data.data.users
       }
 
       error {

examples/basic-app/app/schemas/search-directory.ts

@@ -0,0 +1,5 @@
+import { v } from "@wrnexus/validation";
+
+export const SearchDirectorySchema = v.object({
+  name: v.string().trim().optional(),
+});