Show posture values and report history

Pass/fail was the main device UI signal, but operators need
the agent's observed value. Expose a formatted value per
check, show current postures on the device page, and replace
the Postures tab with paginated report history grouped by
agent push time. Status stays in the model for later rulesets.

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

pkg/deviceagent/agent.go

@@ -28,8 +28,10 @@ import (
 	"time"
 
 	"go.gearno.de/kit/log"
+	"go.probo.inc/probo/pkg/coredata"
 	"go.probo.inc/probo/pkg/deviceagent/checks"
 	"go.probo.inc/probo/pkg/deviceagent/update"
+	"go.probo.inc/probo/pkg/gid"
 )
 
 const (
@@ -450,15 +452,27 @@ func (a *Agent) doPostures(ctx context.Context) {
 		log.Duration("per_check_timeout", perCheckTimeout),
 	)
 
+	deviceID, err := gid.ParseGID(a.cfg.DeviceID)
+	if err != nil {
+		a.Logger.ErrorCtx(ctx, "cannot parse device id for posture correlation", log.Error(err))
+		return
+	}
+
+	correlationID := gid.New(
+		deviceID.TenantID(),
+		coredata.DevicePostureReportEntityType,
+	).String()
+
 	payload := make([]PostureResultPayload, 0, len(results))
 	for _, r := range results {
 		payload = append(
 			payload,
 			PostureResultPayload{
-				CheckKey:   r.CheckKey,
-				Status:     string(r.Status),
-				Evidence:   checks.EvidenceJSON(r.Evidence),
-				ObservedAt: r.ObservedAt,
+				CheckKey:      r.CheckKey,
+				Status:        string(r.Status),
+				Evidence:      checks.EvidenceJSON(r.Evidence),
+				ObservedAt:    r.ObservedAt,
+				CorrelationID: correlationID,
 			},
 		)
 	}

pkg/deviceagent/client.go

@@ -75,10 +75,11 @@ type (
 	}
 
 	PostureResultPayload struct {
-		CheckKey   string          `json:"check_key"`
-		Status     string          `json:"status"`
-		Evidence   json.RawMessage `json:"evidence,omitempty"`
-		ObservedAt time.Time       `json:"observed_at"`
+		CheckKey      string          `json:"check_key"`
+		Status        string          `json:"status"`
+		Evidence      json.RawMessage `json:"evidence,omitempty"`
+		ObservedAt    time.Time       `json:"observed_at"`
+		CorrelationID string          `json:"correlation_id"`
 	}
 
 	PosturesRequest struct {