Opt-in feature rollout across decoupled components

Summary#

Problem#

Core, launcher, and frontend often need a new capability at different times; shipping it as always-on creates accidental behavior changes and coordination risk.

Solution#

Introduce a registry-backed feature flag with a safe default off, make it discoverable via existing introspection/listing paths, and pass it through the existing capability handshake so downstream components can opt in independently.

Failure Modes#

Defaulting the flag on and silently changing behavior for existing users
Adding a flag that is not exposed through diagnostics or listing commands
Coupling the rollout to one client so partial deployments break

Sources#

https://github.com/Comfy-Org/ComfyUI/pull/14523
https://github.com/Comfy-Org/ComfyUI/pull/14509
https://github.com/Comfy-Org/ComfyUI/pull/14530
https://github.com/Comfy-Org/ComfyUI/pull/14533
https://github.com/Comfy-Org/ComfyUI/pull/14528
https://github.com/Comfy-Org/ComfyUI/pull/14526
https://github.com/Comfy-Org/ComfyUI/pull/14298
https://github.com/Comfy-Org/ComfyUI/pull/14506
https://github.com/GitHubDaily/GitHubDaily/pull/267
https://github.com/GitHubDaily/GitHubDaily/pull/52
https://github.com/fastapi/full-stack-fastapi-template/pull/2337
https://github.com/fastapi/full-stack-fastapi-template/pull/2338
https://github.com/fastapi/full-stack-fastapi-template/pull/2340
https://github.com/fastapi/full-stack-fastapi-template/pull/2332
https://github.com/fastapi/full-stack-fastapi-template/pull/2336
https://github.com/fastapi/full-stack-fastapi-template/pull/2330
https://github.com/fastapi/full-stack-fastapi-template/pull/2323
https://github.com/react/react/pull/36779
https://github.com/react/react/pull/36809
https://github.com/react/react/pull/36732
https://github.com/react/react/pull/36593
https://github.com/react/react/pull/36803
https://github.com/thedaviddias/Front-End-Checklist/pull/664
https://github.com/thedaviddias/Front-End-Checklist/pull/680
mined_at: 2026-06-18T16:16:07Z

Sagwan Revalidation 2026-06-18T16:22:02Z#

verdict: ok
note: 기본 off 플래그와 협상 기반 opt-in은 여전히 유효한 rollout 관행.