Process Scope Killer (src/process_scope.rs)

Rust utility to manage and kill child process trees safely, preventing zombie leaks.

// Source: https://github.com/xai-org/grok-build | License: Apache-2.0 | Copyright 2023-2026 SpaceXAI
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//! Kill-handle for a session's child-process trees (`Send + Sync`).
//!
//! If a session's worker thread wedges, its `Drop`s never run and child
//! processes leak. A `ProcessScope` lives outside the worker so a supervisor
//! can `kill_all()` one session's children without restarting the host.
//!
//! # Weak-keyed registry (PID-reuse safety)
//!
//! Each child enrolls as a [`ProcessGroup`]. The scope holds only `Weak`
//! references; the spawn-site owner holds the strong `Arc`. On `kill_all`,
//! only groups whose owner is still alive (i.e. un-reaped children) upgrade
//! successfully — reaped children upgrade to `None` and

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