Add risk assessment boundary model

Introduce RiskAssessmentBoundary as a first-class, self-nesting entity that
groups nodes within a risk assessment scope, and thread it through every
surface.

- coredata: new risk_assessment_boundaries table + migration, boundary_id on
  nodes, self-referential parent_boundary_id, entity type registration
- riskmanagement: boundary CRUD service methods, boundary_id wiring on node
  create/update, scope-membership and self-parent validation, nested-subgraph
  Mermaid rendering
- IAM: core:risk-assessment-boundary:{get,list,create,update,delete} actions
  and viewer/auditor read policies
- console GraphQL: RiskAssessmentBoundary type, connection, order enum, CRUD
  mutations, boundaries field on scope, boundaryId on nodes
- CLI: risk-assessment boundary command group and --boundary-id on nodes
- MCP: boundary tools and boundary_id on node tools
- n8n: boundary operations and boundary fields on node operations
- console UI: boundary list/create/edit, boundary selector on nodes, diagram
  refetch on boundary changes

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/cmd/risk-assessment/boundary/boundary.go

@@ -0,0 +1,40 @@
+// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package boundary
+
+import (
+	"github.com/spf13/cobra"
+	"go.probo.inc/probo/pkg/cmd/cmdutil"
+	"go.probo.inc/probo/pkg/cmd/risk-assessment/boundary/create"
+	"go.probo.inc/probo/pkg/cmd/risk-assessment/boundary/delete"
+	"go.probo.inc/probo/pkg/cmd/risk-assessment/boundary/list"
+	"go.probo.inc/probo/pkg/cmd/risk-assessment/boundary/update"
+	"go.probo.inc/probo/pkg/cmd/risk-assessment/boundary/view"
+)
+
+func NewCmdBoundary(f *cmdutil.Factory) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "boundary <command>",
+		Short: "Manage risk assessment boundaries",
+	}
+
+	cmd.AddCommand(list.NewCmdList(f))
+	cmd.AddCommand(create.NewCmdCreate(f))
+	cmd.AddCommand(view.NewCmdView(f))
+	cmd.AddCommand(update.NewCmdUpdate(f))
+	cmd.AddCommand(delete.NewCmdDelete(f))
+
+	return cmd
+}