tracing

Traces actual Tile executions using an already registered global provider, including Java agents. Fails at Canvas setup if no tracing provider is registered, without initializing global state.

Traces actual Tile executions using the application's provider. The factory runs once at Canvas setup, after duplicate validation; descendants inherit this installation. Separate request Mosaics share configuration, never cached work. Explicit no-op providers are accepted.

The application owns its SDK, sampling, processors, export, and shutdown. Mosaic records delegated Tile names and structural execution data; it never records keys, results, Canvas values, or raw exceptions.