Build a Heart Disease Baseline

You are given a tabular dataset for predicting whether a patient has heart disease. The dataset contains a binary target column such as `has_heart_disease` and several features, for example age, height, weight, blood pressure, cholesterol, smoking status, and other clinical measurements. Using Python, `pandas`, and `seaborn`, walk through how you would: 1. Load and inspect the data. 2. Clean missing values, duplicates, and obviously invalid records. 3. Perform exploratory data analysis and visualize relationships between features and the target. 4. Engineer useful features when appropriate, such as BMI from height and weight. 5. Train a reasonable baseline model for binary classification. 6. Evaluate the model and explain which metrics you would report. 7. Summarize what patterns you found and what you would check before using the model in practice. You may assume standard Python ML libraries are available.