site: Kotlin entity data class has no @serializable; TS @required Zod adds .min(1)

Two more code-example accuracy fixes (matching what the ports actually emit):
- codegen-kotlin emits plain entity data classes — @serializable was dropped
  (decorative; jsonb uses Jackson). Only enums + prompt payloads keep it. Removed
  the stale annotation from the Subscriber data class (kept it on the enum).
- The TS Zod insert schema for a @required string is `.min(1).max(N)` (FR-036
  non-empty), not `.max(N)` alone.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XeGSV3StPCcJGZNNJ4ZfAb

Author: claude

www/index.html

@@ -265,7 +265,7 @@ <h2 class="section-label">From one schema, five languages.</h2>
 });
 
 <span class="keyword">export const</span> SubscriberInsertSchema = z.object({
-  email:  z.string().max(320),
+  email:  z.string().min(1).max(320),
   name:   z.string().optional(),
   status: z.enum([<span class="string">"active"</span>, <span class="string">"paused"</span>, <span class="string">"cancelled"</span>]),
 });
@@ -310,7 +310,6 @@ <h2 class="section-label">From one schema, five languages.</h2>
 <span class="keyword">import</span> java.time.Instant
 <span class="keyword">import</span> kotlinx.serialization.Serializable
 
-@Serializable
 <span class="keyword">public data class</span> Subscriber(
   <span class="keyword">public val</span> id: Long? = <span class="keyword">null</span>,
   <span class="keyword">public val</span> email: String,