fix: copy SessionIdleTimeoutSeconds unconditionally in Go NewClient()

The option was only copied when > 0, which silently normalized negative
inputs. Other SDKs preserve the caller's value and gate only at spawn
time. Align Go to match.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: MackinnonBuck

go/client.go

@@ -218,9 +218,7 @@ func NewClient(options *ClientOptions) *Client {
 		if options.Telemetry != nil {
 			opts.Telemetry = options.Telemetry
 		}
-		if options.SessionIdleTimeoutSeconds > 0 {
-			opts.SessionIdleTimeoutSeconds = options.SessionIdleTimeoutSeconds
-		}
+		opts.SessionIdleTimeoutSeconds = options.SessionIdleTimeoutSeconds
 	}
 
 	// Default Env to current environment if not set