diff --git a/.gitignore b/.gitignore
index 0d3fea3..01684a8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,10 @@
 .rspec_status
 
 *.gem
+
+# Git worktrees for parallel development
+.worktrees/
+
+# Claude Code personal workflows (local only)
+.claude/
+CLAUDE.md
diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..9c25013
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+3.3.6