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/_archive/sample.rhai

@@ -0,0 +1,82 @@
+// This is a sample Rhai script demonstrating the Herodo module functionality
+// It shows the use of file system, process management, and git operations
+
+print("===== Herodo Sample Script =====");
+
+// File System Operations ===========================================
+print("\n===== File System Operations =====");
+
+// Check if directory exists and make it if not
+if !exist("./test_dir") {
+    print("Creating test directory...");
+    mkdir("./test_dir");
+}
+
+// Write a test file
+print("Writing test file...");
+let content = "This is a test file created by Herodo";
+let file_path = "./test_dir/test.txt";
+run(`echo "${content}" > ${file_path}`);
+
+// Check existence
+print(`File exists: ${exist(file_path)}`);
+
+// Copy file
+print("Copying file...");
+let copy_path = "./test_dir/test_copy.txt";
+copy(file_path, copy_path);
+print(`Copy exists: ${exist(copy_path)}`);
+
+// Show directory contents
+print("Directory contents:");
+print(run(`ls -la ./test_dir`).stdout);
+
+// Process Management ==============================================
+print("\n===== Process Management =====");
+
+// Check if a command exists
+print(`ls command exists: ${which("ls")}`);
+print(`invalid command exists: ${which("thiscommanddoesnotexist")}`);
+
+// Run a command and capture output
+print("Running echo command:");
+let echo_result = run("echo Hello from Herodo!");
+print(`  stdout: ${echo_result.stdout}`);
+print(`  success: ${echo_result.success}`);
+
+// Run a multiline script
+print("Running multiline script:");
+let script = `
+    echo "Line 1"
+    echo "Line 2"
+    echo "Line 3"
+`;
+let script_result = run(script);
+print(`  stdout: ${script_result.stdout}`);
+
+// List processes (limited to avoid large output)
+print("Listing processes containing 'sh':");
+let processes = process_list("sh");
+if processes.len() > 0 {
+    print(`Found ${processes.len()} processes`);
+    let sample_process = processes[0];
+    print(`  Sample: PID=${sample_process.pid}, Name=${sample_process.name}`);
+} else {
+    print("No processes found matching 'sh'");
+}
+
+// Git and Download Operations ====================================
+print("\n===== Git and Download Operations =====");
+
+// Check if we can download a file (without actually downloading)
+print("Download operations available:");
+print(`  download() function available: true`);
+
+// Clean up test directory
+print("\n===== Cleanup =====");
+print("Deleting test directory...");
+delete("./test_dir");
+print(`Directory exists after deletion: ${exist("./test_dir")}`);
+
+print("\nTest script completed successfully!");
+"Success"  // Return value