Interface Renderer

Renderer interface. Receives the full stream of semantic lifecycle events (LogEvent) and decides how to display them. The core does not filter scope/bar events by verbosity, so renderers see a faithful record of every scope open/close and bar progress update - embedders consuming the event stream can rely on this for progress UIs that must close themselves on completion. Visibility decisions (e.g. hiding successful scopeEnd footers at non-verbose verbosity) are the renderer's responsibility; logger.getVerbosity is available to consult.

message events for info, warn and debug are gated by verbosity at the façade (see LoggerCore.isLevelVisible) before reaching the renderer; error is always delivered.