Add /task/ to .gitignore

Ignore task directories used by Claude Code subagents.

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

Author: reid-spencer

.gitignore

@@ -31,3 +31,4 @@ language/input/everything.bast
 !.claude/skills/
 language/jvm/src/test/python/.venv/
 __pycache__/
+/task/