Rounds out the per-instance file bridge to the agent's full jailed file
manager so a real file browser can be built on it: POST :id/files/
{delete,rename,mkdir,mkfile,move,copy}, all via requestScoped (license-
scoped reply) on the new agent {op,path} protocol. files.manage. The
broken legacy VueFinder /api/files (retired Go fm_* protocol, wrong
subject, default _INBOX) is superseded by this — frontend rewrite next.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>