Is your feature request related to a problem? Please describe.

Inconsistencies in ID parsing and validation (e.g. taskId, configId) lead to unexpected rejections or silent failures when using characters such as - or ..

For example, task-1 fails to match \w+, but this is not documented anywhere. This causes confusion for clients or API consumers trying to follow best practices for ID naming.

https://github.com/a2aproject/a2a-python/blob/dc95e2a03fe87815702d0a134195480608346ff3/src/a2a/utils/proto_utils.py#L17

Describe the solution you'd like

I’d like to see the supported character set and format explicitly defined for identifiers like:

• taskId
• configId
• artifactId

This could be expressed as a regular expression, such as:

[a-zA-Z0-9_.-]+

Describe alternatives you've considered

N/A

Additional context

N/A

Code of Conduct

• I agree to follow this project's Code of Conduct