Simplified implementation of the feature from PR #6842 (RunzhouLi).
Allows Discord channels/forum threads to auto-bind skills via config:
discord:
channel_skill_bindings:
- id: "123456"
skills: ["skill-a", "skill-b"]
The run.py auto-skill loader now handles both str and list[str],
loading multiple skills in order and concatenating their payloads.
Forum threads inherit their parent channel's bindings.
Co-authored-by: RunzhouLi <RunzhouLi@users.noreply.github.com>