Skip CI for agent/editor config directory changes (#91622)
## Summary
- Add `.agents`, `.claude`, and `.cursor` to the `docs` group in
`CHANGE_ITEM_GROUPS` in `scripts/run-for-change.mjs`
- Changes to these directories (agent skill definitions, editor configs)
don't affect Next.js build/runtime/tests, so CI should skip for them —
same as docs-only changes
- Both `build_and_deploy.yml` and `build_and_test.yml` already use
`run-for-change.mjs --not --type docs` to detect non-docs changes; this
extends that behavior to agent/editor config files
