feat: Add message validation module for data quality checks #2
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Bug 1: validate_message_tree() does len(prompt.text) without checking if prompt is None first — will raise AttributeError on trees with no prompt.
Bug 2: validate_and_log() opens file with log_path.open() but only calls close() at the end — any exception before that line leaves the file handle open.
Bug 3: Text length check uses > instead of >=, so a message with exactly max_length characters passes validation when it should fail.