Python SDK 0.11.2

AGNT5 Python SDK 0.11.2 improves durable workflow state and execution timing.

• Await workflow state writes without blocking the asyncio event loop.
• Route state responses to the dispatch that requested them.
• Measure business execution through the shared native clock while preserving user errors and cancellation if telemetry fails.
• Use the published SDK core 0.2.7 crate for worker session refresh, bounded slot scaling, and execution observations.

Validation: the release changes passed SDK CI, including 865 standalone unit tests; the final registry dependency passed native build validation.

Changes: #39

Published core dependency: #40