Update .gitignore for Python build artifacts

- Add dist/, build/ for build outputs
- Add .coverage, htmlcov/, .pytest_cache/ for testing
- Add .uv_cache/ for uv cache
- Remove overly broad _* pattern

Author: Arun Persaud

.gitignore

@@ -1,4 +1,15 @@
 *~
 __pycache__
-_*
-*.egg-info/
+*.egg-info/
+
+# Build artifacts
+dist/
+build/
+
+# Testing
+.coverage
+htmlcov/
+.pytest_cache/
+
+# uv
+.uv_cache/