• Set restart coordinator socket to nonblocking mode by @cbranch in https://github.com/cloudflare/shellflip/pull/7

• Create semgrep.yml by @hrushikeshdeshpande in https://github.com/cloudflare/shellflip/pull/5
• Add LifecycleHandler::pre_new_process by @bobrik in https://github.com/cloudflare/shellflip/pull/6

• Kill child process if parent state cannot be delivered

• Support setting environment variables in the new process, via environment in RestartConfig.
• Add state transfer from old process to new, via the new lifecycle_handler in RestartConfig.
• The restart task returns the child process as a std::process::Child on successful restart.

Users of v1.0.0 can migrate by:

• partially initialising RestartConfig, now that it implements Default
• ignoring or using the return value from the spawned restart task