geoDeltaAudit 0.1.0

Initial release

• audit_transform() — step-based audit engine for quantifying variable change across arbitrary administrative boundary transformations. Accepts a list of step_* functions and returns an audit_result object with baseline total, final total, delta, and per-step diagnostics.
• step_aggregate() and related step_* helpers — composable transformation steps for building custom audit pipelines.
• prep_hud_crosswalk() and prep_zip_zcta() — crosswalk cleaning and standardization utilities.
• S3 methods for audit_result objects.
• Vignettes: introduction, audit walkthrough, audit workflow, proportionality considerations.
• Includes Hennepin County toy datasets in inst/extdata for running examples without external data dependencies.