0.2.0

Changed

• Requires indexnowkit/core ^0.6 (wave 0a of docs/spec/17: the staging check, the debounce fix). No change in this
  package's own API; upgrade together with the core.

Added

• psalm.xml and a weekly Psalm taint analysis workflow in the monorepo: the reader parses untrusted XML, so tainted
  data flow is checked separately from the phpstan pipeline. Psalm is not a dev dependency.

Documentation

• README: the Google paragraph, "notification, not indexing", and what --changed-since relies on (<lastmod>; a
  run without the option re-announces the whole sitemap; lastmod = now() makes every run a full run).