AI Data Analyst v1.0.0 — "What Changed" drift-check as a GitHub Action

Compare two dataset snapshots and fail your workflow if the change is
statistically significant — a drop-in CI/CD wrapper around the same
root-cause + Welch's t-test / chi-square engine that powers "What Changed"
in the full app. Pure pandas/scipy: no AI key required unless you opt into
a narrated summary.

Usage

- name: Check for significant data drift
  uses: NaiaLorente/data-analyst@v1.0.0
  with:
    file-a: data/last_week.csv
    file-b: data/this_week.csv
    metric: revenue
    segment: region
    fail-on-significant: "true"