v0.7.0

Added

• init(export_timeout=...) sets the timeout for OTLP exporters and batch processors. simple mode defaults to 2 seconds.
• langfuse_preset() sends traces to Langfuse over OTLP.
• invoke_agent() and execute_tool() context managers for GenAI agent and tool spans.

Changed

• shutdown() shuts down the tracer provider and works again after a re-init().
• shutdown_sync() flushes and shuts down providers when called inside a running event loop.