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Implement the server-driven COPY OUT protocol, completing COPY support alongside the existing COPY IN. The server pushes data via CopyData messages after a COPY ... TO STDOUT query, which the new CopyOutReceiver interface delivers through pg_copy_data/pg_copy_complete/pg_copy_failed callbacks. The implementation follows the same state machine pattern as COPY IN: _QueuedCopyOut queued item, _CopyOutInFlight query state, three new backend message types (CopyOutResponse, CopyData, CopyDone) parsed and routed through the existing _ResponseParser/_ResponseMessageParser pipeline, and full shutdown drain support to prevent double-notification.
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Implements the server-driven COPY OUT protocol (COPY ... TO STDOUT), completing COPY support alongside the existing COPY IN.
New public API:
CopyOutReceiverinterface withpg_copy_data,pg_copy_complete,pg_copy_failedcallbacksSession.copy_out(sql, receiver)behaviorThe server drives the flow — after the COPY query, data arrives via
pg_copy_datacallbacks, andpg_copy_completefires when all data has been delivered.Includes 9 new tests (3 parser, 4 mock server, 2 integration), a copy-out example, and documentation updates.