[Feature Request]: Support skills loading scope

[emptyxl]

In the current version of the Claude Agent SDK, it loads all skills under the .claude/skills/ directory by default. I’d like to request more fine-grained control over the scope where skills take effect.

Allow the main Agent and Sub Agents to manually select which skills are enabled/loaded for them.

Sub Agents should be able to preload a full set of skills, similar to Claude Code’s behavior: subagent skills load.