Stop tracking benchmark results; add them to .gitignore

results/ and the loose per-tool outputs in the kit root are regenerated every
run, so they no longer belong in the repo.

.gitignore

@@ -2,8 +2,34 @@
 __pycache__/
 *.pyc
 
-# fio scratch file (created/removed at runtime, in ~/.cache)
+# Benchmark outputs: regenerated every run, never committed.
+results/
+graphs/
 *.bin
 
-# GIMP/GEGL/Inkscape/img scratch
-*.png.tmp
+# Loose result files (some runs write into the kit root, not results/).
+# Raw per-tool outputs:
+7z-*.txt
+7z-1t-*.txt
+openssl-*.txt
+sysbench-*.txt
+passmark-*.txt
+passmark-*.yml
+fio-*.json
+llama-*.txt
+glmark2-*.txt
+vkmark-*.txt
+glxinfo-*.txt
+vulkan-*.txt
+sensors-*.txt
+stress-ng-*.txt
+systemd-analyze-*.txt
+turbostat-*.txt
+# Captured run metadata and derived tables/charts:
+cpu-*.txt
+env-*.txt
+scores-*.csv
+phases-*.csv
+power-*.csv
+compare-scores.csv
+*.png