pub fn dump_dir(instance_key: &str) -> Option<PathBuf>Expand description
%LOCALAPPDATA%\CrashDumps\agentmux-host-hang\<instance_key> — kept
apart from crash dumps (a hang dump and a crash dump mean different things
to triage), and one folder per instance (instance_key = the launcher’s
data-dir hash) so pruning never deletes another running instance’s
evidence (ReAgent P2 on #3913).