docs(core): clarify numeric validation expectations

[khanavi272-spec]

Summary

Updates the control_plane documentation to clarify expectations around numeric parameter validation during protocol configuration.

Changes

• Clarified that numeric protocol parameters should be validated against protocol-defined limits before being accepted by higher-level configuration flows.
• Improved inline documentation without changing runtime behavior.

Testing

• No code changes.
• Documentation-only update.

Closes #108

[N-thnI]

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