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## Depends on merged #4951 Phase 1 merged as `4d22c0ce2b6825c880c818e737b079db494b4053`, so this PR now targets `main`. It reuses the canonical `FunctionWorkerResourceBudget` introduced there rather than copying the type. For Function `add_columns` declarations, Python and Rust now persist `auto_refresh_resource_budget` in computed-column metadata and send it as `auto_refresh_resource_budget` in the remote request. CPU milliseconds and memory bytes are required positive integers. Omitting `gpu_count` is accepted as zero and the canonical outgoing JSON still contains `"gpu_count": 0`. Unknown fields, missing CPU or memory, wrong types, zero CPU or memory, negative values, and overflow are rejected. The same budget is applied to every public output binding of a multi-output Function declaration. Existing metadata is retained, and SQL-expression declarations or local execution reject the budget instead of silently ignoring it. Node is unchanged because its current `addColumns` surface only accepts SQL computed expressions and has no Function declaration path. This change does not implement fleet call concurrency limits or enforce the budget in the runtime. The Enterprise server must support the nested Function worker resource-budget contract before these values can act as execution limits. ## Validation - Python extension build passed. - Remote Function declaration and local unsupported-path rejection each passed. - Canonical metadata round-trip passed, including omitted GPU decoding to zero and explicit `gpu_count: 0` on encode. - Function multi-output remote wire test passed with `--features remote`. - Repository-scoped Python type check passed with 0 errors. - All runtime source blobs match the native-tested source. The post-native deltas are one documentation example line and an existing routing-test stub update for the new optional argument; the affected parameterized test passed 3/3 against the existing extension build. No private test runners are part of this PR.