fix: QA preflight fixes — stale routes, missing hosts, policy URL

- Add workflow + release-orchestrator to hosts file
- Fix scheduler policy URL: policy.stella-ops.local → policy-engine.stella-ops.local
- Fix gateway stale routes: doctor-scheduler → scheduler, vulnexplorer → findings
- Remove stale "policy" from RequiredMicroservices (merged into policy-engine)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

devops/compose/router-gateway-local.json

@@ -29,7 +29,6 @@
                                    "CheckInterval":  "5s",
                                    "RequiredMicroservices":  [
                                                                      "platform",
-                                                                     "policy",
                                                                      "policy-engine",
                                                                      "notify",
                                                                      "scanner",