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/README.md

@@ -0,0 +1,64 @@
+# SAL (System Abstraction Layer) Examples
+
+This directory contains examples demonstrating the SAL DSL modules for system operations.
+
+## Running the Example
+
+```bash
+cargo run --example sal
+```
+
+## Available Scripts
+
+The `scripts/` directory contains various Rhai scripts demonstrating different SAL modules:
+
+### Basics
+- `basics/` - Basic Rhai language features and syntax
+
+### Containers
+- `containers/` - Container management operations
+
+### Git
+- `git/` - Git repository operations
+
+### Hero Vault
+- `hero_vault/` - Secure credential storage and retrieval
+
+### Kubernetes
+- `kubernetes/` - Kubernetes cluster management
+
+### Mycelium
+- `mycelium/` - Mycelium network operations
+
+### Network
+- `network/` - Network utilities and operations
+
+### PostgreSQL
+- `postgresclient/` - PostgreSQL database operations
+
+### Process
+- `process/` - Process management and execution
+
+### Redis
+- `redisclient/` - Redis operations
+
+### Service Manager
+- `service_manager/` - System service management
+
+### Zinit
+- `zinit/` - Zinit service manager operations
+
+## Script Structure
+
+Each script demonstrates:
+- Module initialization
+- Common operations
+- Error handling
+- Best practices
+
+## Configuration
+
+The example uses:
+- Default database path: `/tmp/sal_engine.db`
+- Context isolation per script
+- Verbose output for debugging