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Add practical reproducer tests to verify/trigger the consumer stalling bug: 1. TestConsumerStallingPattern (INTEGRATION REPRODUCER) - Documents exact stalling pattern with setup instructions - Verifies consumer doesn't stall before consuming all messages - Requires running load test infrastructure 2. TestOffsetPlusOneCalculation (UNIT REPRODUCER) - Validates offset arithmetic (committed + 1 = next fetch) - Tests the exact stalling point (offset 163 → 164) - Can run standalone without broker 3. TestEmptyFetchShouldNotStopConsumer (LOGIC REPRODUCER) - Verifies consumer doesn't give up on empty fetch - Documents correct vs incorrect behavior - Isolates the core logic error These tests serve as both: - REPRODUCERS to trigger the bug and verify fixes - DOCUMENTATION of the exact issue with setup instructions - VALIDATION that the fix is complete To run: go test -v -run TestOffsetPlusOneCalculation ./internal/consumer # Passes - unit test go test -v -run TestConsumerStallingPattern ./internal/consumer # Requires setup - integration If consumer stalling bug is present, integration test will hang or timeout. If bugs are fixed, all tests pass.