Refactor: consistent naming across functions, targets, and pkgdown

Functions: prepare_eda_recipe -> build_eda_recipe,
           create_efficiency_plot -> plot_efficiency,
           format_class_imbalance_tourney_gt -> format_tournament_gt

Targets: model_inputs_prefix -> baf_model_input_prefix,
         tbl_fraud_by_month_data -> fraud_by_month_summary,
         model_diag -> diag_fit, winning_params -> best_params,
         production_recipe_blueprint -> prod_recipe,
         final_eval_data -> test_predictions

pkgdown: restructured reference index into 6 logical sections,
         removed stale names and development comments.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

_pkgdown.yml

@@ -2,7 +2,7 @@ url: https://docs.robwiederstein.org/baflakehouse
 
 template:
   bootstrap: 5
-  bootswatch: flatly # Clean, professional look
+  bootswatch: flatly
 
 navbar:
   structure:
@@ -15,44 +15,51 @@ navbar:
 
 reference:
   - title: "Data Ingestion & Lakehouse Setup"
-    desc: "Functions for moving data from CSV to partitioned Parquet in MinIO."
+    desc: "Functions for moving raw CSV data into the MinIO Lakehouse as partitioned Parquet."
     contents:
       - baflakehouse-package
       - convert_to_parquet
       - connect_baf
       - clean_baf_base
-      
+
   - title: "Feature Engineering & Preprocessing"
-    desc: "The 'Recipes' layer of the pipeline."
+    desc: "Recipes and transformations applied across the pipeline layers."
     contents:
       - engineer_features
-      - prepare_eda_recipe
-      - build_baf_recipe          # NEW: Untrained blueprint for production
       - generate_model_inputs
+      - build_eda_recipe
+      - build_baf_recipe
 
-  - title: "The Tournament (Model Selection)"
-    desc: "Cross-validation and imbalance strategy testing."
+  - title: "Exploratory Data Analysis"
+    desc: "Diagnostic model and visualizations for understanding the fraud signal."
+    contents:
+      - train_diag_model
+      - plot_var_imp
+      - plot_hexbin_interaction
+      - plot_missingness
+      - plot_num_cor
+
+  - title: "Model Selection & Tuning"
+    desc: "Imbalance strategy tournament, hyperparameter tuning, and results formatting."
     contents:
       - run_imbalance_tournament
       - tune_lgbm
-      - train_diag_model
-      - create_efficiency_plot    # Moved here: Belongs with the tournament
+      - format_tournament_gt
+      - plot_efficiency
 
   - title: "Final Evaluation & Production Deployment"
-    desc: "Results on unseen data (Months 6-7) and MinIO artifact serialization."
+    desc: "Holdout evaluation on months 6-7 and MinIO model artifact serialization."
     contents:
       - evaluate_final_model
-      - train_production_model    # NEW: The final deployment function
+      - train_production_model
 
-  - title: "Reporting: Tables & Visualizations"
-    desc: "Generating ggplot2 figures and gt tables for Quarto."
+  - title: "Reporting"
+    desc: "Figures, tables, and slide rendering for the Quarto presentation."
     contents:
-      - starts_with("plot_")
-      - starts_with("compute_")
-      - starts_with("format_")    # Neatly catches all your gt table formatters
-
-  - title: "Pipeline Utilities"
-    desc: "Internal helpers for the targets workflow and slide generation."
-    contents:
-      - starts_with("save_report_")
-      - render_slides             # Consolidated here
+      - plot_fraud_by_month
+      - plot_conf_mat_heatmap
+      - compute_fraud_by_month
+      - format_fraud_by_month_gt
+      - save_report_figure
+      - save_report_table
+      - render_slides