driftless 0.2.0

Added

• driftless init-ci — scaffold GitHub Actions workflows (scan, migrate, refine, optional poll/plan) wired to the published composite Action.
• CI hygiene — mypy lint job and a 78% pytest coverage gate.
• Site — updated landing page and docs.

Changed

• In-repo workflows dogfood uses: driftless-dev/driftless@v0.2.0 (composite Action at repo root; no /action path segment).
• Composite Action default version input pins ==0.2.0; documents poll and plan commands.

Install: pip install driftless==0.2.0

Action:

- uses: driftless-dev/driftless@v0.2.0
  with:
    command: scan