hive-forge: the controller-token mint writes straight to the store, and the on-disk token goes

`forgejo-swarm-controller-account`, in the forge's container, now puts
the swarm-controller's forge token into the swarm secret store itself,
under the forge publisher's leaf. The container already receives that
leaf as nspawn system credentials for its journal forwarder; the mint
loads the same three. The token reaches bao on stdin (`value=-`) and
the forge's API through a header file, never as an argument, and never
touches disk.

The mint's guard is a marker holding the published token's name, at
/var/lib/forgejo/swarm-controller-token-name, written last: after the
put, and after every other `swarm-controller-boot-*` token of the
account is revoked through forgejo's admin API, authenticated as the
new token. So a put that failed, or a marker lost while the store kept
an older token, leaves no live token behind once a mint completes. The
mint logs in to the store and checks that the account is a site admin
before it mints, so a store that is down or an account the admin API
would refuse mints nothing on each retry. Failures retry under
store-retry; forgejo does not wait for the mint. No bao read and no
grant change: the forge publisher keeps create/update on the token.

Removed: the host's `swarm-bao-forge-publisher` service and path unit,
which read the token file through the container's root, and their
entries in the store and policy ordering glue. The forge publisher's
policy unit stays; `swarm-bao-forge-oidc` still uses the leaf.

On deploy, an existing forge host has no marker, so the mint runs once:
it mints a new token, publishes it, revokes the old one, and deletes
the old /var/lib/forgejo/swarm-controller-token. The controller's next
forge call gets a 401, re-reads the store and carries on.

nix/host-modules/glue-bao-readers-store-order.nix

@@ -31,7 +31,6 @@ let
   readersHere = {
     # ./hive-forge/default.nix
     swarm-bao-forge-oidc = deployCfg.forgejo.enable;
-    swarm-bao-forge-publisher = deployCfg.forgejo.enable;
     # ./hive-matrix.nix
     swarm-bao-matrix-oidc = deployCfg.matrix.enable;
     # ./otel.nix: `fetches`, the collector loading the file this unit writes