docs(skills): reconcile publicApiKey canonicality across journeys

Follow-up to 063beaf — two journey files committed in c414f64 still
recommended publicLicenseKey as the primary name, which contradicts the
canonical/alias resolution established in the rename table. Source of
truth: packages/react-core/src/v2/providers/CopilotKitProvider.tsx:122-128
— publicApiKey is documented as "The Copilot Cloud public API key";
publicLicenseKey is an "Alias for publicApiKey" and resolution at line 391
is publicApiKey ?? publicLicenseKey.

- 0-to-working-chat: SPA-without-runtime branch uses publicApiKey with
  VITE_CPK_PUBLIC_API_KEY (matches spa-without-runtime SKILL.md).
- go-to-production: dev-only-prop example and "move to Cloud" fix recommend
  publicApiKey instead of publicLicenseKey.

Author: jpr5

skills/0-to-working-chat/SKILL.md

@@ -271,7 +271,7 @@ export default {
 
 ### SPA-without-runtime branch (no server)
 
-Point the provider at CopilotKit Cloud via `publicLicenseKey` — no backend,
+Point the provider at CopilotKit Cloud via `publicApiKey` — no backend,
 no `runtimeUrl`. This is the ONLY production-safe SPA path. See
 `copilotkit/spa-without-runtime` for the full treatment.
 
@@ -281,7 +281,7 @@ import "@copilotkit/react-core/v2/styles.css";
 
 export default function App() {
   return (
-    <CopilotKitProvider publicLicenseKey={import.meta.env.VITE_CPK_LICENSE}>
+    <CopilotKitProvider publicApiKey={import.meta.env.VITE_CPK_PUBLIC_API_KEY}>
       <CopilotChat agentId="default" className="h-full" />
     </CopilotKitProvider>
   );

skills/go-to-production/SKILL.md

@@ -277,13 +277,13 @@ Expected:
 ```tsx
 <CopilotKitProvider runtimeUrl="/api/copilotkit" />
 // or
-<CopilotKitProvider publicLicenseKey="ck_pub_..." />
+<CopilotKitProvider publicApiKey="ck_pub_..." />
 ```
 
 Fail condition: any `agents__unsafe_dev_only={{ ... }}` prop in shipped
 client code — registers agents in the browser and leaks credentials.
 Fix: move agent construction to the server (runtime) or use
-`publicLicenseKey` (Cloud). See `copilotkit/spa-without-runtime`.
+`publicApiKey` (Cloud). See `copilotkit/spa-without-runtime`.
 
 ### Check: no selfManagedAgents in shipped client code