fix: correct managed OAuth credential name lookup for gateway MCP clients

The managed OAuth credential is created with the suffix '-oauth' (e.g.
'my-gateway-oauth') but was being looked up with '-agent-oauth' in
schema-mapper.ts and displayed with '-agent-oauth' in AddGatewayScreen.

This mismatch caused the credential lookup to fail silently, resulting
in an empty provider_name in the generated @requires_access_token
decorator. The agent runtime then crashed with:
  ParamValidationError: Invalid length for parameter
  resourceCredentialProviderName, value: 0, valid min length: 1

Author: aidandaly24

src/cli/operations/agent/generate/schema-mapper.ts

@@ -199,7 +199,7 @@ async function mapGatewaysToGatewayProviders(): Promise<GatewayProviderRenderCon
 
       if (gateway.authorizerType === 'CUSTOM_JWT' && gateway.authorizerConfiguration?.customJwtAuthorizer) {
         const jwtConfig = gateway.authorizerConfiguration.customJwtAuthorizer;
-        const credName = `${gateway.name}-agent-oauth`;
+        const credName = `${gateway.name}-oauth`;
         const credential = project.credentials.find(c => c.name === credName);
 
         if (credential) {

src/cli/tui/screens/mcp/AddGatewayScreen.tsx

@@ -272,7 +272,7 @@ export function AddGatewayScreen({ onComplete, onExit, existingGateways, unassig
                       ? [{ label: 'Allowed Scopes', value: wizard.config.jwtConfig.allowedScopes.join(', ') }]
                       : []),
                     ...(wizard.config.jwtConfig.agentClientId
-                      ? [{ label: 'Agent Credential', value: `${wizard.config.name}-agent-oauth` }]
+                      ? [{ label: 'Agent Credential', value: `${wizard.config.name}-oauth` }]
                       : []),
                   ]
                 : []),