swarm-grafana: fix leaked test title on the agents dashboard

The v2-conversion script carried over the local-test dashboard's own
title ('agents-full-test') instead of the real one, since it read
spec.title straight from the generated ground-truth file without
overriding it back. Caught on a diff review, not by CI — nothing
schema-level flags a wrong-but-valid string.

nix/host-modules/swarm-grafana/dashboards/agents.json

@@ -5,7 +5,7 @@
     "name": "hyperhive-agents"
   },
   "spec": {
-    "title": "agents-full-test",
+    "title": "hyperhive · agents",
     "description": "Per-agent view: resource usage from hive-c0re's container sampler, activity from Claude Code's own export. Renamed from 'overview' — every producer we have today is per-agent, so a genuine swarm overview has nothing cross-cutting to summarise yet and should be built last, not first. Metric names are the OTLP DOTTED form, so every query uses the {__name__=\"...\"} selector — the underscore spelling matches nothing in this store. Cost/token totals use increase(), which is correct here: the claude_code.* counters are cumulative (forced in nix/agent-modules/otel.nix) but reset once per turn, since each turn is a new claude process.",
     "editable": true,
     "cursorSync": "Off",