GET /api/projects now returns only projects owned by the requesting user
or belonging to teams the user is a member of, via a new findAllForUser()
method in the brain projects repo. GET/PATCH/DELETE single-project endpoints
now use canAccessProject() (handling both user and team ownership) instead
of the direct-owner-only assertOwner(). Fixes#197.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>