fix(security): authenticate the orchestrator control plane (issue #400 Critical)

The control plane had no caller authentication — dispatch() routed every
request straight through, and the only guards anywhere were the
(source_ip, identity_token) checks inside /resolve and /attribute, which
authenticate the *bottle* a request is about, not the *caller*. On the
consolidated backends the agent shares a network with the control-plane port
(macOS: the infra container runs 8099 on the agent's --internal network;
docker: the orchestrator container sits on the shared gateway network), so a
prompt-injected agent could GET /bottles (enumerate siblings + policies),
PUT /bottles/<id>/policy (rewrite its own egress allowlist to allow-all),
POST /resolve (read the injected upstream credentials it's never meant to
see), and POST /supervise/respond (self-approve its own proposals). Every
README guarantee collapsed to the agent's discretion.

Fix: a per-host control-plane secret required on every route but GET /health,
compared with hmac.compare_digest. It is held only by the trusted callers and
never handed to an agent:
- minted + persisted 0600 at <root>/control-plane-token (paths.host_control_plane_token);
- injected as $BOT_BOTTLE_CONTROL_PLANE_TOKEN into the orchestrator + gateway
  containers via bare `--env NAME` (value inherited from the launch process,
  so it never lands on argv or in `container/docker inspect`);
- presented by the gateway's PolicyResolver (reads the env) on /resolve, and by
  the host CLI's OrchestratorClient (reads the host file) on every call.

The agent container is never given the env var or the host file, so from a
bottle every /bottles*, /resolve, /attribute, and /supervise/* call now
returns 401 — closing the enumeration, allowlist-rewrite, credential-lift, and
self-approval. The existing (source_ip, identity_token) checks stay as
defense-in-depth.

Enforced when configured: macOS + docker inject the secret (→ enforced). With
no secret set the server runs open and warns loudly at startup — a
fail-visible fallback for the unit suite and for Firecracker, whose
port-scoped nft already blocks agents from 8099 (wiring the secret into its
infra-VM init is a clean fast-follow, left out here to avoid churning the
prebuilt-artifact hash).

Verified end-to-end on real Apple Container: infra comes up healthy, the host
CLI (with the secret) lists bottles while an unauthenticated GET /bottles gets
401, all five issue-#400 attacks from inside the agent get 401, and egress
policy still works (200 allowed / 403 denied) — proving the gateway
authenticates to /resolve with the secret. 1829 unit tests pass, pyright
clean, pylint 9.91.

Refs #400.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/unit/test_orchestrator_gateway.py

@@ -38,7 +38,7 @@ class TestDockerGateway(unittest.TestCase):
     def test_ensure_running_noop_when_up_and_image_current(self) -> None:
         calls: list[list[str]] = []
 
-        def fake(argv: list[str]) -> Mock:
+        def fake(argv: list[str], **_kw: object) -> Mock:
             calls.append(argv)
             if argv[:2] == ["docker", "ps"]:
                 return _proc(stdout=self.sc.name)          # running
@@ -58,7 +58,7 @@ class TestDockerGateway(unittest.TestCase):
         # a rebuild's new flat daemons take effect.
         calls: list[list[str]] = []
 
-        def fake(argv: list[str]) -> Mock:
+        def fake(argv: list[str], **_kw: object) -> Mock:
             calls.append(argv)
             if argv[:2] == ["docker", "ps"]:
                 return _proc(stdout=self.sc.name)
@@ -76,7 +76,7 @@ class TestDockerGateway(unittest.TestCase):
     def test_ensure_running_starts_the_singleton_when_absent(self) -> None:
         calls: list[list[str]] = []
 
-        def fake(argv: list[str]) -> Mock:
+        def fake(argv: list[str], **_kw: object) -> Mock:
             calls.append(argv)
             return _proc(stdout="") if argv[:2] == ["docker", "ps"] else _proc()
 
@@ -102,7 +102,7 @@ class TestDockerGateway(unittest.TestCase):
     def test_ensure_running_creates_network_when_missing(self) -> None:
         calls: list[list[str]] = []
 
-        def fake(argv: list[str]) -> Mock:
+        def fake(argv: list[str], **_kw: object) -> Mock:
             calls.append(argv)
             if argv[:3] == ["docker", "network", "inspect"]:
                 return _proc(returncode=1, stderr="No such network")
@@ -135,7 +135,7 @@ class TestDockerGateway(unittest.TestCase):
     def test_ensure_running_reuses_existing_network(self) -> None:
         calls: list[list[str]] = []
 
-        def fake(argv: list[str]) -> Mock:
+        def fake(argv: list[str], **_kw: object) -> Mock:
             calls.append(argv)
             return _proc(stdout="") if argv[:2] == ["docker", "ps"] else _proc()
 
@@ -144,7 +144,7 @@ class TestDockerGateway(unittest.TestCase):
         self.assertEqual([], [c for c in calls if c[:3] == ["docker", "network", "create"]])
 
     def test_ensure_running_raises_on_docker_failure(self) -> None:
-        def fake(argv: list[str]) -> Mock:
+        def fake(argv: list[str], **_kw: object) -> Mock:
             if argv[:2] == ["docker", "ps"]:
                 return _proc(stdout="")
             if argv[:2] == ["docker", "run"]:
@@ -181,7 +181,7 @@ class TestDockerGatewayBuild(unittest.TestCase):
         # build-if-missing silently ran a stale single-tenant image.
         calls: list[list[str]] = []
 
-        def rec(argv: list[str]) -> Mock:
+        def rec(argv: list[str], **_kw: object) -> Mock:
             calls.append(argv)
             return _proc()  # image present, build succeeds
 
@@ -196,7 +196,7 @@ class TestDockerGatewayBuild(unittest.TestCase):
     def test_ensure_built_no_cache_env_forces_full_rebuild(self) -> None:
         calls: list[list[str]] = []
 
-        def rec(argv: list[str]) -> Mock:
+        def rec(argv: list[str], **_kw: object) -> Mock:
             calls.append(argv)
             return _proc()