inFlightOpsByAgent() read e.agent, a DAG-level field that no longer
exists (agent moved to per-node when DAGs became agent-per-node). So
the SW4RM tab's 'building...'/'meta-updating...' badges never matched
any real agent, and multi-agent DAGs (a startup sweep's MetaLock
cascade, a hive-wide restart) showed nothing at all on the per-agent
cards even while the rebuild queue clearly had them in flight.
Derive each agent's in-flight kind+state from its own node(s) within
the entry instead: a DAG can be 'running' overall while a given
agent's subgraph hasn't started (still queued behind an earlier node
in its chain), so per-node state is also more accurate than the old
per-DAG state for the badge, not just more available.
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