fork of gitlab.com/devnw/zig/thread-pool for zig 0.17

docs(counters-layout): close-out for correctness-only slice

Documents what was landed (cacheline split + extern+align fix + observability test) and what was dropped from the full G3 attempt (wake_hint/steal_hint, null-perf). See docs/performance/counters-layout-fix/README.md for detail.


Author
Date Commit Parent 43dc2260
+102
3 changed files
+102
3 changed files