fix(pgwire): answer a real class for the arm-less error variants - #361
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The blanket INTERNAL_ERROR fallback in error_to_sqlstate flattened 65 of the 101 crate::Error variants, so a statement reading a balance, hitting a period lock, a legal hold, a retention floor, a type guard, or a mirror write got XX000 while the crate's classify() map already carried the class. The fallback now borrows it through classify() and answers from the same numeric table the remote path reads. The bridge exposed one arm doing harm: RetryableSchemaChanged classified as a plan error, which reads as 'fix your SQL' for a condition the lease paths retry. It now classifies as a write conflict (40001), matching its contract.
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Folded into #359: the fallback bridge is the same table's completion, so it ships in the mapper PR instead of a stacked one.