refactor(gateway): fail closed without an orchestrator URL; drop stale single-tenant comments

Follow-ups from the #402 review of the single-tenant data-plane teardown.

- egress_entrypoint.sh: refuse to launch mitmdump when
  BOT_BOTTLE_ORCHESTRATOR_URL is unset, so the fail-closed guarantee no
  longer rests solely on mitmproxy's errorcheck addon exiting on the
  addon's load-time raise. A misconfigured gateway can never come up as
  a bare TLS-bumping open proxy with no policy.
- orchestrator/gateway.py: ensure_running() raises GatewayError on an
  empty orchestrator URL — a URL-less launch would only crash-loop the
  now-resolver-only daemons (egress raises, git-http exits 1, supervise
  exits 2). The env-injection branch is now unconditional.
- Drop stale "single-tenant" / "reads routes.yaml" comments in
  gateway.py and egress_entrypoint.sh, and the /etc/egress/routes.yaml
  layout line in Dockerfile.gateway.
- Tests: gateway fixtures supply an orchestrator URL; add a
  refuse-without-URL test and assert the URL env is injected.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UoEZHDjv84ChoZbozQERhJ

tests/integration/test_orchestrator_docker_gateway.py

@@ -20,7 +20,11 @@ IMAGE = "busybox"
 class TestDockerGatewayIntegration(unittest.TestCase):
     def setUp(self) -> None:
         self.name = "bot-bottle-orch-gateway-itest-" + secrets.token_hex(4)
-        self.sc = DockerGateway(IMAGE, name=self.name)
+        # Resolver-only data plane (PRD 0070) requires an orchestrator URL to
+        # run; busybox never dials it, so a placeholder is enough here.
+        self.sc = DockerGateway(
+            IMAGE, name=self.name, orchestrator_url="http://orchestrator:9000",
+        )
         self.addCleanup(self.sc.stop)
 
     def _count(self) -> int: