- Add ConfigProfile model with user ownership, name, description
- Add ConfigInclude model for ordered profile self-references
- Add ConfigMount model for mount/file definitions
- Add selected_profile_id to ToolInstance for per-instance profile selection
- Add default profile properties to UserConfig JSONB config
- Create Alembic migration 0013 for new tables and columns
- Register new models in models/__init__.py
- Mark config_folders.is_active as deprecated
- Add migration metadata test
Quality gates: syntax check passed (all files parse successfully)
OpenSpec: add-config-profiles task 1.1
