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Xuanwo
426684cf1b
## Problem Enterprise Function-backed computed columns need a stable SDK contract before Sophon catalog and execution endpoints can be added. The existing `Job` API can only represent unit terminal results, and there is no shared Rust/Python wire definition for immutable Function versions, applications, bindings, or refresh results. ## Behavior This introduces remote-only canonical Function values in Rust and Python, evolves `Job<T = ()>` to decode typed remote terminal results while keeping local spawned operations unit-typed, and fixes the cross-language contract with shared JSON golden fixtures. Unknown fields and discriminator values remain forward-decodable, while canonical output contains only fields known to the client. Function models contain secret names only. Sophon remains the sole owner of catalog persistence, environment bake, secret resolution, execution, and publication. This PR does not add authoring/catalog endpoints, local execution, refresh runners, or live Sophon E2E coverage.