v0.5.0

Breaking

• Replace Daemon::send with Daemon::index; remove public DaemonOp export
• Daemon::serve takes ServeConfig instead of loose arguments

Features

• Ship sift-daemon in GitHub release assets and install.sh
• Collapse daemon into index/daemon/mod.rs with inline Daemon::serve event loop

Refactor

• Tighten daemon API: Daemon::bootstrap, Daemon::executable, domain methods on grouped serve types (#100)