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refactor(logging): Extract format_data method from JsonLogger
Extract the data formatting logic into a separate `format_data` method that can be overridden by prepended modules. This enables the upcoming FieldValidator to intercept and inspect log data without modifying the core logging flow. The extracted method: - Receives severity, timestamp, progname, and message - Returns the formatted data hash - Is called by `call` before JSON serialization No functional changes to logging behavior.