0.1.0

First release (spec 17 §6.1, wave F). Requires indexnowkit/core ^0.9.

Added

• Verify\VerifyingSubmitter — the pre-flight decorator of SubmitterInterface: one GET per URL before the
  decorated submitter sends it. noindex (X-Robots-Tag, <meta name="robots">), a robots.txt disallow, another
  canonical URL, a redirect and an origin error become skipped Results with Reason::Noindex, RobotsDisallowed,
  NonCanonical, Redirected, OriginError; 404 and 410 pass as deletions. Policies verify.redirect: skip|follow
  (after a 301/308 both URLs are submitted, after a 302/303/307 the original), verify.non_canonical: skip|replace,
  verify.origin_error: skip|send; a redirect or a canonical to a host without a key is always a skip. Listeners
  registered on the decorator see every result exactly once; the skipped results go to the PSR-14 dispatcher and the
  submission store. verify.max_batch (100) sends larger batches unverified with a warning; verify.delay waits
  before the first GET outside a web request; enabled: false (the default) is a transparent delegate.
• Verify\PageSignals — the parser of the signals (fromResponse(url, Response): status, noindex,
  noindexSource, canonical, location, contentType), regular expressions over the <head> of the first
  MAX_BYTES (256 KiB), no ext-dom; Verify\UrlReference::resolve() for relative href and Location values.
• Verify\RobotsCache — robots.txt once per host and process, shared through the PSR-16 cache under
  <debounce.key_prefix>robots.<host> (verify.robots_cache_ttl); an unavailable robots.txt allows with one warning.
• Verify\VerifyConfig — the verify block (OPTIONS, fromArray(), disabled(), loadOrDisabled(),
  transportConfig(Config), userAgent()), the enums RedirectPolicy, NonCanonicalPolicy, OriginErrorPolicy.
• Verify\Check\SampleCheck — check --sample=<url> / --sample-class=<FQCN>[:<id>]: one line per sample
  (verify.sample), warnings only.
• Documents: docs/configuration.md, docs/operations.md (the fixed log lines), docs/bc.md.