[BUG](docs): User Experience - Establishing Documentation Authority

### What happened?

* Page URL: https://a2a-protocol.org/latest/topics/life-of-a-task/
* Problem: The official A2A documentation directs users to external forums for core conceptual clarity, which undermines its authority.
* Proposed Fix: Incorporate the information from external forums into the official documentation to make it the definitive source of truth.
* Justification: This will establish the official documentation as a complete and authoritative resource.

### Relevant log output

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### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

The issue points to the page https://a2a-protocol.org/latest/topics/life-of-a-task/. First, locate the source files for this documentation in the repository, likely in a `docs/` directory. Review the content on that page and identify the specific sections that currently refer users to external forums. Research the referenced external forum discussions to understand the missing conceptual clarity. The goal is to integrate that information directly into the official docs, making them a complete resource.

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