/claim #1700

Description

This PR implements per-commit benchmarking using NativeLink as a remote cache.

It resolves #1700

Summary of Changes:

• Created benchmark.sh to measure Bazel build time
• Simplified basic_cas.json5 for local CAS+AC setup (no worker/scheduler needed)
• Added .github/workflows/benchmark.yml to run benchmarks on every commit
• Benchmark results are uploaded as benchmark_results.csv artifacts

Fixes # (issue)

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

• Manually ran benchmark.sh locally with NativeLink running via Nix
• Verified Bazel build output is cached via NativeLink
• Confirmed GitHub Actions successfully triggers benchmark, logs CSV artifact
• Tested on multiple commits and pull requests

Checklist

• Updated documentation (added README section)
• Tests added/amended (benchmark script and config)
• bazel test //... passes locally (if tests exist)
• PR is contained in a single commit

This change is