chore: add .ci-venv/ to gitignore

Prevents CI virtualenv artifacts from breaking local builds.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: acailic

.gitignore

@@ -3,6 +3,7 @@ __pycache__/
 
 .venv/
 .venv-ci/
+.ci-venv/
 venv/
 .python-version