rename: role badge stays 'manager'; unify harness unit name to hive-ag3nt

nix/templates/harness-base.nix

@@ -110,8 +110,8 @@ in
     example = "manager";
     description = ''
       Whether this container runs as a sub-agent (`"agent"`, the
-      default — invokes `hive-ag3nt serve`) or as the swarm's
-      manager (`"manager"` — invokes `hive-root serve` and
+      default) or as the swarm's manager (`"manager"` — both invoke
+      `hive serve`;
       defaults the forge notification surface to mentions-only).
 
       meta.rs flips this to `"manager"` for the manager container
@@ -690,7 +690,7 @@ in
       }
     ];
 
-    # Per-agent unix user. Runs the hive-ag3nt / hive-root harness +
+    # Per-agent unix user. Runs the hive harness +
     # co-process daemons under a non-root principal. UID auto-assigned by
     # NixOS. The container activation script (hive-agent-user-migrate)
     # chowns the bind-mounted state dir — including credential files
@@ -1277,14 +1277,12 @@ in
       ];
     };
 
-    # Role-driven harness systemd unit: one binary, two unit names
-    # for log/ExecStartPre stability. Unit shape (PATH wrapper-dir
-    # trick, env vars, RuntimeDirectory, User=, standalone-eval
-    # fallbacks): docs/agent-hierarchy.md::Harness systemd unit
-    # shape (per-role). PATH /bin auto-append behaviour:
-    # docs/gotchas.md::systemd.services.*.path appends /bin to
-    # every entry.
-    systemd.services.${if config.hyperhive.role == "manager" then "hive-root" else "hive-ag3nt"} =
+    # Harness systemd unit. Unit shape (PATH wrapper-dir trick, env vars,
+    # RuntimeDirectory, User=, standalone-eval fallbacks):
+    # docs/agent-hierarchy.md::Harness systemd unit shape. PATH /bin
+    # auto-append behaviour: docs/gotchas.md::systemd.services.*.path
+    # appends /bin to every entry.
+    systemd.services.hive-ag3nt =
       let
         isManager = config.hyperhive.role == "manager";
         binary = "hive";

nix/templates/manager.nix

@@ -2,7 +2,7 @@
 {
   imports = [ ./harness-base.nix ];
 
-  # Manager role: the role-driven `systemd.services.hive-root` plus
+  # Manager role: the `systemd.services.hive-ag3nt` unit plus
   # the manager-only forge defaults (`keepSubscriptions = false`,
   # `skipNotifyReasons = [ "subscribed" "participating" ]`) live in
   # `harness-base.nix` under `lib.mkIf (config.hyperhive.role ==