swarm-ci-runner: run the forge CI runner as a swarm service

The CI runner was a hive deploy module: hive-ci.nix ran it beside the
forge, and hive-c0re registered it through the forge's admin API with
the `core` token, writing the registration token through hive-priv. It
could only run on the forge's host, and it kept an admin-scoped forge
token on a hive.

Now the runner is a swarm service:

- swarm-ci-runner.nix runs it in a `swarm-ci-runner` container on the
  host that sets deploy.ci-runner.enable, reaching the forge by name.
  It needs neither the forge nor a hive there.
- swarm-controller reads the forge's runner registration token with its
  own admin token and writes it to swarm/services/ci-runner/
  registration-token whenever it differs from what it last wrote. Its
  grant on that path is create/update only.
- The runner's own leaf (CN swarm-ci-runner, role and policy of the same
  name) reads that one path. swarm-bao-ci-runner.service fetches it into
  the runner's EnvironmentFile and restarts the runner on a change.
- A pre-start step removes .runner when the daemon's journal since its
  last start holds Forgejo's "unregistered runner" refusal (the daemon
  exits 1 when its startup Declare gets it), or when .runner names
  another forge address; upstream's pre-start step then registers again.

Removed from the hive side: hive-ci.nix and deploy.forgejo.ci.*,
forge/ci_runner.rs, PrivRequest::RegisterCiRunner and its handler and
ReadWritePaths entry, InfraContainer::Ci with hivectl's --ci and the
dashboard's hive-ci journal entry, HYPERHIVE_FORGE_CI_ENABLED, and
read:admin,write:admin from CORE_TOKEN_SCOPES: nothing else in hive-c0re
calls /api/v1/admin/*. The old ci options, under both swarm.forge.ci and
deploy.forgejo.ci, now fail evaluation naming deploy.ci-runner.

The forge's half of the old ci.enable, the actions/checkout mirror and
DEFAULT_ACTIONS_URL = self, is deploy.forgejo.actionsFromSelf.

Closes #4954

nix/host-modules/glue-bao-tls.nix

@@ -105,6 +105,8 @@ in
       # The store forwarder's.
       forwarderOidcClientCertFile = lib.mkDefault "${pkiDir}/forwarder-oidc.pem";
       forwarderOidcClientKeyFile = lib.mkDefault "${pkiDir}/forwarder-oidc-key.pem";
+      ciRunnerClientCertFile = lib.mkDefault "${pkiDir}/ci-runner.pem";
+      ciRunnerClientKeyFile = lib.mkDefault "${pkiDir}/ci-runner-key.pem";
 
       # The granter: every `swarm-bao-*-policy` unit on this host logs in with
       # it. ⚠️ Unlike every other leaf here, never the file an operator copies:
@@ -256,6 +258,12 @@ in
         [ -s ${pkiDir}/nats-auth.pem ] || ${signLeaf} ${pkiDir} nats-auth \
           ${lib.escapeShellArg deployCfg.bao.natsAuthCommonName} "" clientAuth
 
+        # The CI runner's token fetch. Minted here for the matrix-ctl leaf's
+        # reason: the runner is a swarm singleton, so on a runner host without
+        # the store this is the file an operator copies.
+        [ -s ${pkiDir}/ci-runner.pem ] || ${signLeaf} ${pkiDir} ci-runner \
+          ${lib.escapeShellArg deployCfg.bao.ciRunnerCommonName} "" clientAuth
+
         ${lib.optionalString deployCfg.hive-controller.enable ''
           # This hive's gateway-leaf identity, which opens
           # `pki/issue/<hiveLeafPkiRolePrefix>-<hive>` and nothing else. Its