chore(demo): remove .evolve dir from workspace and ignore globally (#146)

Dir was accidentally committed in a26429d (#138). Expand .gitignore
pattern from /.evolve to .evolve so it is ignored in subdirs too.

Author: vinodmut

.gitignore

@@ -12,6 +12,6 @@ demo/workdir/.claude/
 .claude
 dist
 .coverage
-/.evolve
+.evolve
 .secrets
 event.json