Add test/run-interactive.sh that runs tmux interactive tests on
the host in an isolated HOME. Covers macOS ssh-keygen which
cannot be tested in Linux containers. e2e.sh now runs host
interactive tests first, then container matrix. Skips gracefully
if tmux is not installed.
Closes: #23🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
