chore: add Ruby version and ignore personal Claude workflows

- Set Ruby 3.3.6 via .ruby-version (fixes native gem ABI issues)
- Ignore .claude/ and CLAUDE.md (personal workflows stay local)

Author: vishaltps

.gitignore

@@ -15,3 +15,7 @@
 
 # Git worktrees for parallel development
 .worktrees/
+
+# Claude Code personal workflows (local only)
+.claude/
+CLAUDE.md

.ruby-version

@@ -0,0 +1 @@
+3.3.6