[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

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