nix: run the review classifier in a container of its own when a host enables it

deploy.review-classifier.enable (off by default, not derived from
allSwarmServices) puts swarm-review-classifier in its own network
namespace on the bridge, with claude-code and the daemon. A host unit
copies the classifier's store leaf into the container; the daemon reads
its queue client secret and the API key from the store with it.

- glue-bao-tls mints the review-classifier leaf; swarm-bao writes the
  swarm-review-classifier role, reading exactly the API key path and the
  classifier's queue client secret; swarm.nix reserves its CN.
- glue-review-classifier-oidc-client registers the machine client where
  authelia runs, and the publisher carries its secret to the store.
- swarm-nats passes the client id to the responder as
  --review-classifier-client.
- Where the host runs a hive-tier collector, claude exports its metrics
  there; the daemon adds the repo and the PR to the resource attributes.
- module-eval: the new grant and leaf (bao-grants, now sixteen granting
  units), the container's presence and its unit (core-toggle), and the
  client registration and publishing (secret-publisher).

nix/host-modules/swarm.nix

@@ -55,6 +55,7 @@ let
     deployCfg.bao.granterCommonName
     deployCfg.bao.natsAuthCommonName
     deployCfg.bao.ciRunnerCommonName
+    deployCfg.bao.reviewClassifierCommonName
     deployCfg.bao.forgePublisherCommonName
   ]
   # The per-hive subjects, spelled out per hive rather than as the prefix.