feat: Add service manager support

- Add a new service manager crate for dynamic service management
- Integrate service manager with Rhai for scripting
- Provide examples for circle worker management and basic usage
- Add comprehensive tests for service lifecycle and error handling
- Implement cross-platform support for macOS and Linux (zinit/systemd)

service_manager/README.md

@@ -1,16 +1,20 @@
-# Service Manager
+# SAL Service Manager
 
-This crate provides a unified interface for managing system services across different platforms.
-It abstracts the underlying service management system (like `launchctl` on macOS or `systemd` on Linux),
-allowing you to start, stop, and monitor services with a consistent API.
+[![Crates.io](https://img.shields.io/crates/v/sal-service-manager.svg)](https://crates.io/crates/sal-service-manager)
+[![Documentation](https://docs.rs/sal-service-manager/badge.svg)](https://docs.rs/sal-service-manager)
+
+A cross-platform service management library for the System Abstraction Layer (SAL). This crate provides a unified interface for managing system services across different platforms, enabling dynamic deployment of workers and services.
 
 ## Features
 
-- A `ServiceManager` trait defining a common interface for service operations.
-- Platform-specific implementations for:
-  - macOS (`launchctl`)
-  - Linux (`systemd`)
-- A factory function `create_service_manager` that returns the appropriate manager for the current platform.
+- **Cross-platform service management** - Unified API across macOS and Linux
+- **Dynamic worker deployment** - Perfect for circle workers and on-demand services
+- **Platform-specific implementations**:
+  - **macOS**: Uses `launchctl` with plist management
+  - **Linux**: Uses `zinit` for lightweight service management (systemd also available)
+- **Complete lifecycle management** - Start, stop, restart, status monitoring, and log retrieval
+- **Service configuration** - Environment variables, working directories, auto-restart
+- **Production-ready** - Comprehensive error handling and resource management
 
 ## Usage
 
@@ -18,13 +22,55 @@ Add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-service_manager = { path = "../service_manager" }
+sal-service-manager = "0.1.0"
 ```
 
-Here is an example of how to use the `ServiceManager`:
+Or use it as part of the SAL ecosystem:
+
+```toml
+[dependencies]
+sal = { version = "0.1.0", features = ["service_manager"] }
+```
+
+## Primary Use Case: Dynamic Circle Worker Management
+
+This service manager was designed specifically for dynamic deployment of circle workers in freezone environments. When a new resident registers, you can instantly launch a dedicated circle worker:
 
 ```rust,no_run
-use service_manager::{create_service_manager, ServiceConfig};
+use sal_service_manager::{create_service_manager, ServiceConfig};
+use std::collections::HashMap;
+
+// New resident registration triggers worker creation
+fn deploy_circle_worker(resident_id: &str) -> Result<(), Box<dyn std::error::Error>> {
+    let manager = create_service_manager();
+
+    let mut env = HashMap::new();
+    env.insert("RESIDENT_ID".to_string(), resident_id.to_string());
+    env.insert("WORKER_TYPE".to_string(), "circle".to_string());
+
+    let config = ServiceConfig {
+        name: format!("circle-worker-{}", resident_id),
+        binary_path: "/usr/bin/circle-worker".to_string(),
+        args: vec!["--resident".to_string(), resident_id.to_string()],
+        working_directory: Some("/var/lib/circle-workers".to_string()),
+        environment: env,
+        auto_restart: true,
+    };
+
+    // Deploy the worker
+    manager.start(&config)?;
+    println!("✅ Circle worker deployed for resident: {}", resident_id);
+
+    Ok(())
+}
+```
+
+## Basic Usage Example
+
+Here is an example of the core service management API:
+
+```rust,no_run
+use sal_service_manager::{create_service_manager, ServiceConfig};
 use std::collections::HashMap;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
@@ -52,3 +98,54 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }
 ```
+
+## Examples
+
+Comprehensive examples are available in the SAL examples directory:
+
+### Circle Worker Manager Example
+
+The primary use case - dynamically launching circle workers for new freezone residents:
+
+```bash
+# Run the circle worker management example
+herodo examples/service_manager/circle_worker_manager.rhai
+```
+
+This example demonstrates:
+- Creating service configurations for circle workers
+- Complete service lifecycle management
+- Error handling and status monitoring
+- Service cleanup and removal
+
+### Basic Usage Example
+
+A simpler example showing the core API:
+
+```bash
+# Run the basic usage example
+herodo examples/service_manager/basic_usage.rhai
+```
+
+See `examples/service_manager/README.md` for detailed documentation.
+
+## Prerequisites
+
+### Linux (zinit)
+
+Make sure zinit is installed and running:
+
+```bash
+# Start zinit with default socket
+zinit -s /tmp/zinit.sock init
+```
+
+### macOS (launchctl)
+
+No additional setup required - uses the built-in launchctl system.
+
+## Platform Support
+
+- **macOS**: Full support using `launchctl` for service management
+- **Linux**: Full support using `zinit` for service management (systemd also available as alternative)
+- **Windows**: Not currently supported