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Connection responses now declare the selected backend's statistics and statistic-name support. Grainlift protocol 0.5 clients can return ADBC NOT_IMPLEMENTED locally when a backend explicitly reports false, saving an HTTP round trip for each unsupported metadata call. Unknown support continues remote dispatch, and table schemas remain fresh.
Requires a Grainlift 0.5 client; upgrade clients and workers together. SDK tests and the shared Rust wire contract pass.