chore: gitignore .wolf (OpenWolf working dir)

Ignore the local-only OpenWolf assistant working directory so it is never
committed. Nothing is tracked today; this is preventive.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: ebourgeois

.gitignore

@@ -12,4 +12,7 @@ __pycache__/
 # Source: docs/architecture/calm/templates/mermaid/*.md.hbs
 /docs/src/architecture/
 
-.DS_Store
+.DS_Store
+
+# OpenWolf working dir — local-only, never committed
+.wolf/