Gitignore .claude/ session state (#65)

The Claude Code CLI creates .claude/worktrees/ when a subagent runs with
isolation: worktree. That directory is per-session and per-developer
state, not project state, so it shouldn't be tracked.

Co-authored-by: Claude <noreply@anthropic.com>

Author: dolph

.gitignore

@@ -14,3 +14,6 @@ find-replace
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+
+# Claude Code session state (worktrees, etc.)
+.claude/