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

@@ -9,3 +9,4 @@ hs_err_pid*
 # Apple stuff
 .DS_Store
 /project/Scalafmt.scala
+/task/