* fix(emulator): scope emulator list to the worktree's sessions
emulator list ignored --worktree and returned serve-sim's global iOS helper list. It now lists the session registry's attached sessions (iOS and Android) for the selected worktree, or every worktree's for --worktree all.
* fix(emulator): drop stopped devices before listing sessions
* fix(emulator): point the no-active hint at emulator devices
* test(emulator): assert list results, not serve-sim calls
* refactor(emulator): prune stopped devices inside the registry listing