[NFR]: Reduce coupling #62

Reduce coupling between components, ensure single source of truth for elements in the code i.e. no two areas defining the same thing.

• Request history: History\HistoryRecorder holds the workflow and Core::createHistory() creates
  it. ResponseListener takes one recorder in place of three arguments, and the providers no longer
  duplicate the boot steps. CONTROLLER_NAMESPACE moves to Mvc\HistoryListener.
• Panel contract: The PHP and JavaScript tests read the same fixture, and static analysis rejects an
  unknown panel name. The unused $icon and widget.icon are removed, and private shapes move from
  DebugBarTypes to their collectors.
• Redaction: Redactor::redactUri() masks sensitive query values in the request panel and in
  stored history, and LoggerCollector redacts the log context. Query bindings are not redacted, and the
  docs state this.
• Debug facade: The logger adapters read the active bar at log time, so you can create them before
  boot. Core::getBar() replaces the static read in the providers.
  • Response rules: RequestContext replaces three copies of the client address rule.
    Injector::isHtml() is separate from the injection rules, and the ADR debug page uses it.
• Worker limit: The docs state the effect of a long-lived worker on request history.