concore_cli: add a 'watch' command for live simulation monitoring

[avinxshKD]

right now if you want to see what's happening during a running simulation you have to manually cat the port files or stare at print output from each node. There's no single-pane view of the overall state.

proposing a concore watch <study_dir> command that polls the port directories and shows a live terminal view, simtime, current port values, active edges, and which nodes are writing. Basically docker stats but for concore studies.

This fits into the existing CLI (concore_cli/) and doesn't touch any runtime code.

[avinxshKD]

working on this, as discussed earlier