AGENTS.md: Add pre-commit command to existing CI requirements line (#7930)
## Summary
- Added explicit `pre-commit run --files <changed_files>` command to the
existing CI requirements line in AGENTS.md/CLAUDE.md
- Clarifies that only modified files should be checked, not the entire
codebase
## Changes
- Enhanced the existing pre-commit bullet point in "Commit & CI
requirements" section (no new section added)
Signed-off-by: Guokai Ma <guokai.ma@intel.com>