Distinguish missing CDP inventories from observed empty arrays, retain valid
accessibility and worker siblings, and admit required fields before scope
inference. Stop interpreting DOM documents without a usable string table.
Validated producer semantics and simulated CDP provider boundaries; this does
not establish real Chrome or Electron engine behavior.
Refs #3376, #3379, #3850.
Co-authored-by: 李云周 <154221037+YunzhouLi-hub@users.noreply.github.com>
Co-authored-by: Kaoru0822 <208281322+kaoru0822-kitauji@users.noreply.github.com>