refactor: unify component naming — control_plane/control_auth -> orchestrator

The codebase used "control plane" both as an architectural role term AND
as an identifier alias for the orchestrator component, producing
duplicate names for one thing (control_plane_url vs orchestrator_url,
CONTROL_PLANE_PORT, host_control_plane_token, …). Going forward the
concrete component is always named for what it is — Gateway or
Orchestrator — and the plane vocabulary is reserved for prose (module
descriptions, the security argument).

Renamed (identifiers + the in-repo env/wire/file string values, all
setters/getters are in this repo so the change is atomic):

  ControlPlaneServer            -> OrchestratorServer
  control_plane_url             -> orchestrator_url
  probe_control_plane_url       -> probe_orchestrator_url
  host_control_plane_token      -> host_orchestrator_token
  CONTROL_PLANE_PORT            -> ORCHESTRATOR_PORT
  CONTROL_PLANE_TOKEN_ENV/FILE  -> ORCHESTRATOR_TOKEN_ENV/FILENAME
  BOT_BOTTLE_CONTROL_PLANE_TOKEN-> BOT_BOTTLE_ORCHESTRATOR_TOKEN
  control-plane-token (file)    -> orchestrator-token

  control_auth (module)         -> orchestrator_auth  (stays top-level;
                                   the gateway imports it and must not
                                   import the orchestrator/ package)
  CONTROL_AUTH_HEADER           -> ORCHESTRATOR_AUTH_HEADER
  x-bot-bottle-control-auth     -> x-bot-bottle-orchestrator-auth
  CONTROL_AUTH_JWT_ENV          -> ORCHESTRATOR_AUTH_JWT_ENV
  BOT_BOTTLE_CONTROL_AUTH_JWT   -> BOT_BOTTLE_ORCHESTRATOR_AUTH_JWT
  _control_auth_headers         -> _orchestrator_auth_headers

Prose plane-terms ("control plane", "data plane") are preserved,
including the test name test_data_plane_daemons_get_jwt_not_key (it
names the security invariant). Gateway and orchestrator verified to
agree on the renamed wire header; full unit suite green (2243).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/unit/test_macos_infra.py

@@ -10,7 +10,7 @@ from bot_bottle.backend.macos_container.infra import (
     INFRA_DB_VOLUME,
     MacosInfraService,
     OrchestratorStartError,
-    probe_control_plane_url,
+    probe_orchestrator_url,
 )
 
 _INFRA = "bot_bottle.backend.macos_container.infra"
@@ -110,7 +110,7 @@ class TestInfraEnsureRunning(unittest.TestCase):
             mod.try_container_ipv4_on_network.return_value = "192.168.128.2"
             endpoint = svc.ensure_running()
         run.assert_not_called()
-        self.assertEqual("http://192.168.128.2:8099", endpoint.control_plane_url)
+        self.assertEqual("http://192.168.128.2:8099", endpoint.orchestrator_url)
         self.assertEqual("192.168.128.2", endpoint.gateway_ip)
 
     def test_changed_source_recreates(self) -> None:
@@ -176,16 +176,16 @@ class TestCaCertPem(unittest.TestCase):
                 svc.ca_cert_pem(timeout=0)
 
 
-class TestProbeControlPlane(unittest.TestCase):
+class TestProbeOrchestrator(unittest.TestCase):
     def test_returns_url_when_running(self) -> None:
         with patch(f"{_INFRA}.container_mod") as mod:
             mod.try_container_ipv4_on_network.return_value = "192.168.128.2"
-            self.assertEqual("http://192.168.128.2:8099", probe_control_plane_url())
+            self.assertEqual("http://192.168.128.2:8099", probe_orchestrator_url())
 
     def test_empty_when_absent(self) -> None:
         with patch(f"{_INFRA}.container_mod") as mod:
             mod.try_container_ipv4_on_network.return_value = ""
-            self.assertEqual("", probe_control_plane_url())
+            self.assertEqual("", probe_orchestrator_url())
 
 
 if __name__ == "__main__":