docs: name the swarm display name by its new path

Two sites spelled it as a brace group, services.hyperhive.{hiveName,
swarmName}, which no anchored rewrite can handle correctly now that only
one of the two moves; both are written out separately. One of them is an
MCP tool description, so it is rendered into every agent's system prompt.

hive-c0re/src/container_view.rs

@@ -268,7 +268,9 @@ fn read_active_model(name: &hive_types::Ident) -> Option<String> {
 
 /// Host-side hive + swarm display names, read from the c0re service's
 /// own process env. The `hive-c0re.nix` module sets these from
-/// `services.hyperhive.{hiveName, swarmName}`. The agent-side
+/// `services.hyperhive.hiveName` + `services.hyperhive.swarm.name`
+/// (the hive names itself; the swarm it joins is named one level out).
+/// The agent-side
 /// `hive-agent::identity::{hive_name, swarm_name}` accessors read the
 /// same env vars after they're forwarded into each sub-agent's
 /// harness service environment by `meta::render_flake`; surfacing

hive-c0re/src/dashboard/state_snapshot.rs

@@ -117,7 +117,7 @@ pub(super) struct StateSnapshot {
     hive_name: Option<String>,
     /// Human name of the wider swarm this hive belongs to (e.g.
     /// `"constellat1on"`). Sourced from `HYPERHIVE_SWARM_NAME` env
-    /// var, set from `services.hyperhive.swarmName`. `None` when
+    /// var, set from `services.hyperhive.swarm.name`. `None` when
     /// unset — chrome omits the swarm segment of the breadcrumb.
     swarm_name: Option<String>,
     /// Peer hives in the same swarm. Parsed from `HYPERHIVE_PEERS`