Rework README around benchmark evidence

.gitignore

@@ -10,3 +10,5 @@
 *.so
 *.dylib
 *.egg-info/
+machine.yaml
+logs/

CONTRIBUTING.md

@@ -34,7 +34,7 @@ python scripts/benchmark_suite.py \
 ## Release workflow
 
 1. Update benchmark artifacts if the public performance story changed.
-2. Ensure `README.md`, the notebook, and `benchmarks/results/*.json` agree with the current implementation.
+2. Ensure `README.md` and `benchmarks/results/*.json` agree with the current implementation.
 3. Tag the release as `vX.Y.Z`.
 4. Push the tag to trigger `.github/workflows/release.yml`.
 5. Verify the uploaded GitHub release artifacts and the published PyPI files.

Cargo.toml

@@ -1,10 +1,10 @@
 [package]
 name = "clostera"
-version = "1.0.4"
+version = "1.0.5"
 edition = "2024"
 
 [features]
-default = ["openblas-system"]
+default = []
 openblas-system = ["ndarray-linalg/openblas-system"]
 openblas-static = ["ndarray-linalg/openblas-static"]
 python = ["dep:numpy", "dep:pyo3", "pyo3/extension-module"]
@@ -23,6 +23,9 @@ rand_chacha = "0.9"
 rayon = "1.11"
 thiserror = "2.0"
 
+[build-dependencies]
+pkg-config = "0.3"
+
 [dev-dependencies]
 approx = "0.5"
 criterion = { version = "0.5", default-features = false, features = ["html_reports"] }

benchmarks/results/frontier/frontier-cache-pq4-first3-20260425-auto.hardware.json

@@ -0,0 +1,18 @@
+{
+  "cpu_model": "AMD EPYC 9575F 64-Core Processor",
+  "physical_cores": 128,
+  "logical_cores": 256,
+  "ram_gb": 2267,
+  "ram_speed": "5600 MT/s",
+  "storage": "/dev/sda         28T   18T  9.0T  67% /data",
+  "os": "Linux 6.8.0-106-generic",
+  "blas_backend": "OpenBLAS",
+  "threads": {
+    "blas": 128,
+    "omp": 128,
+    "rayon": 128
+  },
+  "cpu_governor": "performance",
+  "turbo_boost": "enabled",
+  "date_utc": "2026-04-25T21:01:44Z"
+}