- Add InvalidClientTokenId, ValidationError to SqsErrors (was causing panic: WriteHeader code 0) - Extract applyEnvironmentDefaults() with defer in LoadYamlConfig (VT=30 even without config file) - Dockerfile: copy goaws.yaml to /conf/, pass --config flag - Fix SendMessageBatch form parsing for AWS Query Protocol - Add hardcore_test.sh (61 tests, 14 groups) - Remove temp debug logs from delete_message.go