CrewAI 1.14.3 adds checkpoint support and cuts cold start by ~29%

CrewAI `1.14.3` expands agent infrastructure with lifecycle events for checkpoint operations and adds checkpoint and fork support to standalone agents. New integrations include e2b, Daytona sandbox tools, Bedrock V4, and an Azure `DefaultAzureCredential` fallback when no API key is provided. A performance optimization to the MCP SDK and event types reduces cold start time by ~29%, and security patches bump `lxml` to `>=6.1.0` and `python-dotenv` to `>=1.2.2`.