Give the counter sample integer MessagePack keys

CounterState in samples/eve-browser-network used string [Key]s, which the
registry rejects at registration, so the provider threw on open. Keys are now
0 counterId, 1 count, 2 receipts. The payload becomes a MessagePack array, so
the browser lowerer reads count positionally instead of by field name. The
getting-started chapter carried the same string-key shape and is corrected to
match.

BenchItem needed nothing: a5d1be6 already marked it [MessagePackObject]; the
earlier scan rejection came from a stale benchmark build. After rebuilding,
both types register.

No .cc stores exist under samples.

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

samples/eve-browser-network/Program.cs

@@ -467,9 +467,9 @@ sealed class Args
 [MessagePackObject]
 public sealed class CounterState
 {
-    [Key("counterId")] public string CounterId { get; set; } = "";
-    [Key("count")] public int Count { get; set; }
-    [Key("receipts")] public Dictionary<string, IncrementReceipt> Receipts { get; set; } = new(StringComparer.Ordinal);
+    [Key(0)] public string CounterId { get; set; } = "";
+    [Key(1)] public int Count { get; set; }
+    [Key(2)] public Dictionary<string, IncrementReceipt> Receipts { get; set; } = new(StringComparer.Ordinal);
     public static CounterState Initial(string counterId) => new() { CounterId = counterId };
 }
 

samples/eve-browser-network/browser/main.ts

@@ -7,6 +7,10 @@ import {
   decodeCultNetPayload,
 } from "cultmesh-browser";
 
+// CounterState is an integer-keyed MessagePack object: [counterId, count, receipts].
+const counterCount = (record: Parameters<typeof decodeCultNetPayload>[0]) =>
+  decodeCultNetPayload<[string, number, unknown]>(record)[1];
+
 declare global {
   interface Window {
     __sampleReady?: boolean;
@@ -83,17 +87,17 @@ try {
     stateBindingResolver: async binding => {
       if (binding.pointerId !== "sample.counter.count") return undefined;
       return {
-        latest: async () => decodeCultNetPayload<{ count: number }>(counter.current!).count,
+        latest: async () => counterCount(counter.current!),
         watch: callback => counter.watch(record => {
           if (!record) return;
-          const count = decodeCultNetPayload<{ count: number }>(record).count;
+          const count = counterCount(record);
           window.__sampleCount = count;
           callback(count);
         }),
       };
     },
   });
-  window.__sampleCount = decodeCultNetPayload<{ count: number }>(counter.current!).count;
+  window.__sampleCount = counterCount(counter.current!);
   window.__sampleReady = true;
 } catch (error) {
   const details = error instanceof AggregateError

src/GameCult.Mesh/docs/getting-started/01-persist-typed-state.md

@@ -15,8 +15,8 @@ using MessagePack;
 [MessagePackObject]
 public sealed class CounterState
 {
-    [Key("counterId")] public string CounterId { get; set; } = "";
-    [Key("count")] public int Count { get; set; }
+    [Key(0)] public string CounterId { get; set; } = "";
+    [Key(1)] public int Count { get; set; }
 }
 ```