Adding a prompt with a name that is taken causes a server crash

[johnsonr]

While this may be invalid usage, it definitely should not crash the server.

Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
18:50:18.060 [main] ERROR SpringApplication - Application run failed
io.modelcontextprotocol.spec.McpError: Prompt with name 'com.embabel.example.horoscope.StarNewsFinder.writeup' already exists
	at io.modelcontextprotocol.server.McpAsyncServer.lambda$addPrompt$27(McpAsyncServer.java:508)
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:45)
	at reactor.core.publisher.Mono.subscribe(Mono.java:4576)
	at reactor.core.publisher.Mono.block(Mono.java:1778)
	at io.modelcontextprotocol.server.McpSyncServer.addPrompt(McpSyncServer.java:103)
	at com.embabel.agent.mcpserver.McpSyncServerConfiguration.exposeMcpPrompts(McpSyncServerConfiguration.kt:166)
	at com.embabel.agent.mcpserver.McpSyncServerConfiguration.exposeMcpFunctionality(McpSyncServerConfiguration.kt:92)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:382)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:254)
	at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:173)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:454)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:387)
	at com.embabel.agent.spi.support.DelegatingAgentScanningBeanPostProcessor.onApplicationEvent(AutoRegistration.kt:106)
	at com.embabel.agent.spi.support.DelegatingAgentScanningBeanPostProcessor.onApplicationEvent(AutoRegistration.kt:80)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:454)
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:387)
	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:1009)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:630)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:318)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350)
	at com.embabel.example.AgentMcpServerApplication.main(AgentMcpServerApplication.java:53)
	Suppressed: java.lang.Exception: #block terminated with an error
		at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:104)
		at reactor.core.publisher.Mono.block(Mono.java:1779)
		... 29 common frames omitted
18:50:18.146 [ForkJoinPool.commonPool-worker-1] WARN  StdioClientTransport - Process terminated with code 255