Fix KID default suffix and guard exit code alignment

- Change default KID suffix from -key-v1 to -key-1 to match Go SDK and Console
- Change guard script exit code from 2 to 1 to match Python and Go SDKs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/client.ts

@@ -60,7 +60,7 @@ export class ElydoraClient {
     this.baseUrl = (config.baseUrl ?? DEFAULT_BASE_URL).replace(/\/+$/, '');
     this.ttlMs = config.ttlMs ?? DEFAULT_TTL_MS;
     this.maxRetries = config.maxRetries ?? DEFAULT_MAX_RETRIES;
-    this.kid = config.kid ?? this.agentId + '-key-v1';
+    this.kid = config.kid ?? this.agentId + '-key-1';
     this.prevChainHash = ZERO_CHAIN_HASH;
   }