v0.5.2

• forAll() called from a helper (not directly in the test method) now warns
  on stderr, the way a closure-derived id already did. Its id names the helper,
  so every test using that helper shares one corpus entry and overwrites the
  others' counterexample — a stable-looking id that is silently wrong. Pin it
  with ->id() to silence the warning.
• PROPERTY_DB with credentials in its userinfo (redis://user:pass@host) is
  rejected instead of silently dropped — parse_url would discard them and the
  connection would go without AUTH. The error never echoes the DSN.
• The resolved corpus is memoized per PROPERTY_DB value, so a suite sharing a
  Redis corpus builds one client (and opens one connection) rather than one per
  property. Mirrors the Testo adapter.