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* fix(gateway): gate declared multi-instance deployments and require the redis stream bridge GATEWAY_WORKERS / WEB_CONCURRENCY only count the uvicorn workers of one process tree, so a Kubernetes Deployment with replicas > 1 (one worker per Pod) passed every multi-worker startup check while each Pod's startup orphan reconciliation wrote the other Pods' lease-less runs off as crashed on every rolling update. Add `deployment.multi_instance` as an explicit declaration that runs the same gate, plus a DEER_FLOW_MULTI_INSTANCE env override so deploy tooling can set the declaration from its replica count without editing config.yaml (wiring the Helm chart to export it is a separate change). Both the worker count and the declaration now also require a Redis stream bridge and refuse an explicit memory sandbox ownership store, since the memory bridge and ownership store are process-local. The agent-storage divergence warning, the inbound webhook dedupe warning and the WeChat QR-login guard honor the same declaration. * docs(changelog): link the multi-instance gate entry to #6328 * fix(ci): bump chart config_version to 53 and keep AGENTS.md under the size limits config.example.yaml moved to config_version 53 for the new deployment section, so the Helm chart's embedded config and its README example follow. The multi-instance notes in backend/AGENTS.md and backend/app/gateway/AGENTS.md shrink to one line each: main already sits within 55 bytes of the per-file hard limit for the gateway guide and within 163 bytes of the chain hard limit under backend/, and the full contract lives in backend/docs/CONFIGURATION.md. * fix(gateway): name every active knob in the multi-process rollback When GATEWAY_WORKERS > 1 and a multi-instance declaration are both active, the refusal offered only "Set GATEWAY_WORKERS=1", so an operator who followed it bounced through a second refusal on DEER_FLOW_MULTI_INSTANCE / deployment.multi_instance at the next start. The rollback now withdraws both knobs, and the browser-tools refusal takes the same path instead of the worker-count-only message. multi_instance_declaration() returns a frozen MultiInstanceDeclaration (source, value) with knob/rollback properties instead of a display string, so deps.py no longer branches on message prose. Tests pin the combined rollback text and that following it actually clears the gate. * docs(gateway): keep the gateway AGENTS.md under the size hard limit after merging main main grew backend/app/gateway/AGENTS.md by 30 bytes, which left it 25 bytes under the 49152-byte hard limit; the one-sentence multi-instance note from this branch pushed the merged file to 49164. Shorten that sentence by 18 bytes so scripts/check_agent_guidance.py passes on the merge result. * ci: re-run checks after test_stop_cancels_a_hung_driver_poll flaked on shard 4 tests/test_mcp_task_service.py::test_stop_cancels_a_hung_driver_poll timed out once on backend-unit-tests (4) for 2c16206ac. The MCP task service and its test are identical to main, main's run for cfe2023df passed, and 15 consecutive local runs pass; the test gives service.stop() a 1s budget while cancellation drain allows 5s, so a loaded runner can exceed it. Fork contributors cannot re-run a job, hence this empty commit. --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>