prock 0.2.3

Fast, low-overhead CPU statistics for process trees
Documentation 
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# prock

Fast, low-overhead CPU statistics for process trees.

Uses direct syscalls for minimal overhead (~1-5µs per process):
- **macOS**: `proc_pid_rusage` via libproc
- **Linux**: `/proc/[pid]/stat` filesystem reads

## Features

- CPU time (user + system) in nanoseconds
- Memory usage (RSS and virtual)
- Disk I/O statistics
- Process tree discovery (parent/child relationships)
- Tree-wide aggregation (sum stats across process + all descendants)

## Usage

```rust
use prock::{get_cpu_time, get_memory, get_all_stats};

// Get CPU time for a single process
if let Some(cpu) = get_cpu_time(pid) {
    println!("CPU: {}ns user, {}ns system", cpu.user_ns, cpu.system_ns);
}

// Get memory for a single process
if let Some(mem) = get_memory(pid) {
    println!("Memory: {} bytes", mem);
}

// Get all stats at once (more efficient for multiple metrics)
if let Some(stats) = get_all_stats(pid) {
    println!("CPU: {:?}, Memory: {}", stats.cpu_time, stats.memory_bytes);
}
```

## Platform Support

| Platform | Status |
|----------|--------|
| macOS | Full support via libproc |
| Linux | Full support via /proc |
| Other | Fallback (returns None) |