Ignore both Rust and Python build artifacts

.gitignore

@@ -1,6 +1,27 @@
-# Rust build output
+# --- Rust ---------------------------------------------------------------
+# Cargo build output (debug/release builds, incremental caches)
 /target/
 
+# --- Python -------------------------------------------------------------
+__pycache__/
+*.pyc
+*.pyo
+
+# Virtual environment
+.venv/
+
+# Tooling caches
+.mypy_cache/
+.ruff_cache/
+.pytest_cache/
+
+# Logs (loguru file sink)
+logs/
+
+# PyInstaller build artifacts (dist/ is committed — see DESIGN_DOCUMENT §13)
+build/
+
+# --- Common -------------------------------------------------------------
 # Environment and secrets
 .env