0.4.0 onReload(), --forward-signal, TransparentProcess, bugfixes

Added

• --forward-signal CLI option — forward signals to the process (e.g. SIGUSR1 or 10)
• TransparentProcess::start() — runs a command inheriting stdin/stdout/stderr and forwarding signals
• BC break: $onReload parameter in hotReload() — optional callback invoked before each reload

Fixed

• hotReload() now correctly terminates the running task when files change; previously the task could outlive the restart
• hotReload() no longer outputs anything; use $onReload to handle reload notifications

Changed

• BC break: $process parameter of hotReload() renamed to $task
• BC break: bin/hot-reload no longer forwards any signals by default; use --forward-signal to opt in
• BC break: Default --term-timeout changed from 10s to 3s
• Require thesis/exceptionally ^0.3
• Require symfony/console ^7.0 || ^8.0