diff --git a/.gitignore b/.gitignore
index 320ba4c..ffd1f0d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,31 @@ lefthook-local.yml
 # Profiling artifacts
 trace-*.out
 *.pprof
+
+# ── GSD baseline (auto-generated) ──
+.gsd
+.DS_Store
+Thumbs.db
+*.swp
+*.swo
+*~
+.idea/
+.vscode/
+*.code-workspace
+.env
+.env.*
+!.env.example
+node_modules/
+.next/
+dist/
+build/
+__pycache__/
+*.pyc
+.venv/
+venv/
+target/
+vendor/
+*.log
+coverage/
+.cache/
+tmp/