Add the PlatformStatusMonitor

Implementation is a straight substitution: add `StatusMonitorModule` to `FalconWiring`, solder the consensus round output and the heartbeat into it, and route its status output to the two places that currently receive the hardcoded injection, plus the results collector. It is a prerequisite for freeze and reconnect, both of which are defined in terms of status transitions.

Start in FalconWiring and locate StatusMonitorModule, then trace the consensus round output, heartbeat, current hardcoded injection sites, and the results collector. Done means the module receives the round and heartbeat signals and its status output reaches both existing injection targets and the results collector.

Written by the indexing model from the issue text.