Initial commit: BAF Lakehouse fraud detection pipeline

End-to-end LightGBM fraud detection pipeline built as an R package,
orchestrated by targets with data stored in MinIO via Apache Arrow.
Includes 6-layer Lakehouse architecture, class imbalance tournament,
formally tuned hyperparameters (PR-AUC 0.198), and Quarto RevealJS slides.

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

man/format_fraud_by_month_gt.Rd

@@ -0,0 +1,17 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/functions.R
+\name{format_fraud_by_month_gt}
+\alias{format_fraud_by_month_gt}
+\title{Format fraud-by-month table as a gt object}
+\usage{
+format_fraud_by_month_gt(x)
+}
+\arguments{
+\item{x}{Tibble from compute_fraud_by_month().}
+}
+\value{
+A gt table.
+}
+\description{
+Format fraud-by-month table as a gt object
+}