feat: reorganize examples and add signature support to JobBuilder

- Reorganized examples into osiris/, sal/, and utils/ folders
- Moved hardcoded scripts to separate .rhai files
- Added signature() method to JobBuilder for job signing
- Updated OSIRIS context to use block_in_place instead of runtime
- Removed runtime field from OsirisContext
- Added typed save() methods for Note and Event objects
- Updated all examples to use new structure and APIs

examples/sal/scripts/kubernetes/basic_operations.rhai

@@ -0,0 +1,72 @@
+//! Basic Kubernetes operations example
+//!
+//! This script demonstrates basic Kubernetes operations using the SAL Kubernetes module.
+//! 
+//! Prerequisites:
+//! - A running Kubernetes cluster
+//! - Valid kubeconfig file or in-cluster configuration
+//! - Appropriate permissions for the operations
+//!
+//! Usage:
+//!   herodo examples/kubernetes/basic_operations.rhai
+
+print("=== SAL Kubernetes Basic Operations Example ===");
+
+// Create a KubernetesManager for the default namespace
+print("Creating KubernetesManager for 'default' namespace...");
+let km = kubernetes_manager_new("default");
+print("✓ KubernetesManager created for namespace: " + namespace(km));
+
+// List all pods in the namespace
+print("\n--- Listing Pods ---");
+let pods = pods_list(km);
+print("Found " + pods.len() + " pods in the namespace:");
+for pod in pods {
+    print("  - " + pod);
+}
+
+// List all services in the namespace
+print("\n--- Listing Services ---");
+let services = services_list(km);
+print("Found " + services.len() + " services in the namespace:");
+for service in services {
+    print("  - " + service);
+}
+
+// List all deployments in the namespace
+print("\n--- Listing Deployments ---");
+let deployments = deployments_list(km);
+print("Found " + deployments.len() + " deployments in the namespace:");
+for deployment in deployments {
+    print("  - " + deployment);
+}
+
+// Get resource counts
+print("\n--- Resource Counts ---");
+let counts = resource_counts(km);
+print("Resource counts in namespace '" + namespace(km) + "':");
+for resource_type in counts.keys() {
+    print("  " + resource_type + ": " + counts[resource_type]);
+}
+
+// List all namespaces (cluster-wide operation)
+print("\n--- Listing All Namespaces ---");
+let namespaces = namespaces_list(km);
+print("Found " + namespaces.len() + " namespaces in the cluster:");
+for ns in namespaces {
+    print("  - " + ns);
+}
+
+// Check if specific namespaces exist
+print("\n--- Checking Namespace Existence ---");
+let test_namespaces = ["default", "kube-system", "non-existent-namespace"];
+for ns in test_namespaces {
+    let exists = namespace_exists(km, ns);
+    if exists {
+        print("✓ Namespace '" + ns + "' exists");
+    } else {
+        print("✗ Namespace '" + ns + "' does not exist");
+    }
+}
+
+print("\n=== Example completed successfully! ===");