Eric Traut
d87d918716
Fixes #19257. ## Summary Agent roles declared in config layers can set `config_file` to a relative path, but deserializing the layer-local `[agents.*]` table happened without an `AbsolutePathBuf` base path. That caused configs like `config_file = "agents/my-role.toml"` to fail with `AbsolutePathBuf deserialized without a base path`. This updates agent role layer loading to deserialize `[agents.*]` while the layer config folder is active as the path base, matching the behavior documented for `AgentRoleToml.config_file`. It also adds coverage for a user config layer with a relative agent role `config_file`.
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