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/process/run_basic.rhai

@@ -0,0 +1,18 @@
+print("Running a basic command using run().execute()...");
+
+// Execute a simple command
+let result = run("echo Hello from run_basic!").execute();
+
+// Print the command result
+print(`Command: echo Hello from run_basic!`);
+print(`Success: ${result.success}`);
+print(`Exit Code: ${result.code}`);
+print(`Stdout:\n${result.stdout}`);
+print(`Stderr:\n${result.stderr}`);
+
+// Example of a command that might fail (if 'nonexistent_command' doesn't exist)
+// This will halt execution by default because ignore_error() is not used.
+// print("Running a command that will fail (and should halt)...");
+// let fail_result = run("nonexistent_command").execute(); // This line will cause the script to halt if the command doesn't exist
+
+print("Basic run() example finished.");