WIP (hive-sh4re only; hive-c0re construction follows). Reshapes the
dashboard/hivectl queue wire per mara's redesign (#2637):
- DagView is now a thin projection: { id, source, reason, created_at, nodes }.
Dropped the rolled-up kind (Template)/state/started_at/finished_at/inputs/
approval_id — the client derives label + roll-up state + DAG timestamps
from the node set.
- NodeView drops step + inline build_log_id; started_at/finished_at are
chrono DateTime<Utc> (off the hive_jobq Node); non-derivable per-node
payload rides the owning node (approval_id on the approval node, inputs
on the meta_lock node).
- Deleted the Template enum entirely.
Done nodes are excluded from the wire (a fully-done DAG disappears; a
failed DAG lingers until the history cap). Build logs move to an on-demand
GET /api/build-log/<node_id> query (next commits).
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