[Copilot]

URI rendering could omit @ when excluding the password, and appended path segments were not encoded. URI-template extraction mismatch behavior remains a documented dependency limitation.

• User-info rendering: Keep the delimiter when rendering the username without the password:

  $uri->toString(Uri::ALL & ~Uri::PASSWORD); // https://admin@example.com/foo

• Path appending: Encode appended path characters while preserving existing percent escapes.

• Fixes [URI] bugs #1378