0.9.0

Added

• sitemap --new-only and Sitemap\SeenStoreInterface (wave N, spec 19b §3.5): submit only the URLs that are new
  or changed since the last run of the command, whatever <lastmod> says or does not say. The interface (Implement
  tier: unseen(iterable<SitemapEntry>): iterable<SitemapEntry>, remember(iterable<SitemapEntry>): void) keeps the
  fingerprint of every announced entry — URL plus <lastmod> in ISO 8601, or empty; Console\SitemapRunner takes it
  as the appended, named $seen (SitemapServices::runner(…, seen:) likewise), calls unseen() once after the host
  filter and remember() per batch whose results did not fail — with or without the option, never with --dry-run —
  so a full run followed by scheduled --new-only runs announces each change once. Console\SitemapOptions::$newOnly;
  Console\Definitions::sitemap() declares the option for every adapter. Without a store the option answers
  SitemapRunner::NO_SEEN_STORE (--new-only needs a store of seen URLs; this application has none (the CLI keeps one in its state file).) with exit 2 and reads nothing — the framework adapters have none in this wave; the indexnow
  CLI (indexnowkit/cli) keeps one in its sqlite state file. The summary line gains , N new or changed.
  --changed-since and --new-only add up: the window first, then the store.

Changed

• Requires indexnowkit/core ^0.13.1.