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_policy_resolver.py

@@ -8,11 +8,11 @@ import urllib.error
 from unittest.mock import MagicMock, patch
 
 from bot_bottle.gateway.policy_resolver import (
-    CONTROL_AUTH_HEADER,
-    CONTROL_AUTH_JWT_ENV,
+    ORCHESTRATOR_AUTH_HEADER,
+    ORCHESTRATOR_AUTH_JWT_ENV,
     PolicyResolveError,
     PolicyResolver,
-    _control_auth_headers,
+    _orchestrator_auth_headers,
 )
 
 _URLOPEN = "bot_bottle.gateway.policy_resolver.urllib.request.urlopen"
@@ -29,16 +29,16 @@ def _http_error(code: int) -> urllib.error.HTTPError:
     return urllib.error.HTTPError("http://x/resolve", code, "err", {}, None)  # type: ignore[arg-type]
 
 
-class TestControlAuthHeaders(unittest.TestCase):
+class TestOrchestratorAuthHeaders(unittest.TestCase):
     def test_sends_the_gateway_jwt_when_configured(self) -> None:
-        with patch.dict("os.environ", {CONTROL_AUTH_JWT_ENV: "gateway.jwt.tok"}):
-            self.assertEqual({CONTROL_AUTH_HEADER: "gateway.jwt.tok"}, _control_auth_headers())
+        with patch.dict("os.environ", {ORCHESTRATOR_AUTH_JWT_ENV: "gateway.jwt.tok"}):
+            self.assertEqual({ORCHESTRATOR_AUTH_HEADER: "gateway.jwt.tok"}, _orchestrator_auth_headers())
 
     def test_sends_nothing_when_unset(self) -> None:
         import os
         with patch.dict("os.environ", {}, clear=False):
-            os.environ.pop(CONTROL_AUTH_JWT_ENV, None)
-            self.assertEqual({}, _control_auth_headers())
+            os.environ.pop(ORCHESTRATOR_AUTH_JWT_ENV, None)
+            self.assertEqual({}, _orchestrator_auth_headers())
 
 
 class TestPolicyResolver(unittest.TestCase):