morfBeacon - v0.7.0

Added

• Emitter role in the parc. The heartbeat and /status now carry a role
  field: host (a general-purpose machine hosting services) or device (standalone
  equipment such as an ESP32 sensor). PresenceConfig gains a role field (default
  host) and kRoleHost / kRoleDevice constants; the Arduino emitter defaults to
  device. Additive and backward compatible: an announcement without role reads as
  host. This lets a consumer (morfMonitor) tell a whole host going offline (all its
  host services vanish together) from a single device being absent, and a local
  dashboard mean "my machine plus the parc's devices".