Expose ITAM devices on MCP, CLI, and n8n

Devices were only available through GraphQL and the agent API. Add
list/get/revoke/delete/set-owner across MCP, prb, and n8n, with latest
postures nested on list and get responses.

Signed-off-by: Ludovic Vielle <ludovic@probo.com>

pkg/cmd/device/shared/posture.go

@@ -0,0 +1,37 @@
+// Copyright (c) 2026 Probo Inc <hello@probo.com>.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package shared
+
+type (
+	PostureValue struct {
+		Kind   string `json:"kind"`
+		Text   string `json:"text"`
+		Number *int   `json:"number"`
+	}
+
+	Posture struct {
+		ID         string       `json:"id"`
+		CheckKey   string       `json:"checkKey"`
+		Status     string       `json:"status"`
+		Value      PostureValue `json:"value"`
+		ObservedAt string       `json:"observedAt"`
+	}
+)