This commit optimizes the repository validation script (`scripts/ci_validate_repo.py`)
by consolidating multiple file-traversal passes into a single efficient pass.
Key improvements:
- Combined size and NUL byte checks into a single `validate_files` function.
- Implemented early size checks using `p.stat().st_size` to avoid reading invalid files.
- Replaced full-file reading (`read_bytes`) with chunked binary reading (64KB)
to ensure a constant memory footprint and enable early exit on NUL byte detection.
- Reduced syscall overhead and I/O by minimizing redundant traversals.
Ref: Bolt Philosophy - "Speed is a feature", "Measure first, optimize second".
