fix(slurm): add default 30s timeout to HTTP client

Replaces http.DefaultClient with a client that has a 30s timeout to prevent indefinite hangs when the Slurm REST API is unresponsive.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

internal/slurm/client.go

@@ -9,6 +9,7 @@ import (
 	"net/http"
 	"net/url"
 	"strings"
+	"time"
 )
 
 const (
@@ -16,6 +17,8 @@ const (
 	DefaultBaseURL = "http://localhost:6820/"
 	// DefaultUserAgent is the default User-Agent header value.
 	DefaultUserAgent = "slurm-go-sdk"
+	// DefaultTimeout is the default HTTP request timeout.
+	DefaultTimeout = 30 * time.Second
 )
 
 // Client manages communication with the Slurm REST API.
@@ -85,7 +88,7 @@ type Response struct {
 // http.DefaultClient is used.
 func NewClient(baseURL string, httpClient *http.Client) (*Client, error) {
 	if httpClient == nil {
-		httpClient = http.DefaultClient
+		httpClient = &http.Client{Timeout: DefaultTimeout}
 	}
 
 	parsedURL, err := url.Parse(baseURL)