restic's tool bundle sets no MESH_BROKER_FILE: the node's runtime sets it for a tool bundle

The validator refused the manifest: a bundle's env may not set what the runtime gives every tool bundle. The processes
night and awake keep theirs.

Builds: ADR 0192

Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h

modules/restic/module.json

@@ -219,7 +219,6 @@
           "MESH_BACKUP_PASSWORD_FILE": "${dir:state}/repository.secret",
           "MESH_BACKUP_STATE": "${dir:state}",
           "MESH_BACKUP_DATA": "${dir:state}/data.conf",
-          "MESH_BROKER_FILE": "${dir:state}/broker",
           "MESH_BACKUP_PUT_OFF_BOUND_FILE": "${dir:state}/put-off-bound"
         }
       },