Add role to AgentConfigFile

[dmitryax]

Adds optional role to AgentConfigFile so agent-specific implementations can distinguish top-level configuration from supplementary content.

Fixes #184

[tigrannajaryan]

This looks good to me.

[tigrannajaryan]

@dmitryax do you want to make this ready for review?

[Copilot]

Pull request overview

Adds an optional role field to AgentConfigFile to let agent implementations distinguish top-level configuration from other config-related/supplementary content (per #184).

Changes:

• Extended AgentConfigFile in the protobuf schema with string role = 3.
• Documented the new field and its agent-type-specific semantics in the specification.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
specification.md	Documents the new role field and its intended usage for remote/effective configuration files.
proto/opamp.proto	Adds role to the wire schema for AgentConfigFile and includes field-level documentation.

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[dmitryax]

@tigrannajaryan sorry, I missed this PR. Marked as ready for review

[tigrannajaryan]

I will keep it open for a bit in case @andykellr or @evan-bradley want to review.

[RassK]

The description is a bit vague, I did not get the exact point.
The first part is very generic:

The values and their semantics are Agent type-specific.

The name itself suggests some fixed purpose.

Why not then just metadata instead of a role, so it's much more compatible with wider needs?