Fix design-vs-implementation gaps found in verification

Critical fixes:
- Wire monitor subsystem to agent startup (was dead code)
- Implement NodeStatus RPC (disk, memory, CPU, runtime version, uptime)
- Deploy respects active=false (sets desired_state=stopped, not always running)

Medium fixes:
- Add Started field to runtime.ContainerInfo, populate from podman inspect
- Populate ComponentInfo.started in status handlers for uptime display
- Add Monitor field to Agent struct for graceful shutdown

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/agent/deploy.go

@@ -37,8 +37,9 @@ func (a *Agent) Deploy(ctx context.Context, req *mcpv1.DeployRequest) (*mcpv1.De
 	}
 
 	var results []*mcpv1.ComponentResult
+	active := spec.GetActive()
 	for _, cs := range components {
-		result := a.deployComponent(ctx, serviceName, cs)
+		result := a.deployComponent(ctx, serviceName, cs, active)
 		results = append(results, result)
 	}
 
@@ -46,11 +47,16 @@ func (a *Agent) Deploy(ctx context.Context, req *mcpv1.DeployRequest) (*mcpv1.De
 }
 
 // deployComponent handles the full deploy lifecycle for a single component.
-func (a *Agent) deployComponent(ctx context.Context, serviceName string, cs *mcpv1.ComponentSpec) *mcpv1.ComponentResult {
+func (a *Agent) deployComponent(ctx context.Context, serviceName string, cs *mcpv1.ComponentSpec, active bool) *mcpv1.ComponentResult {
 	compName := cs.GetName()
 	containerName := serviceName + "-" + compName
 
-	a.Logger.Info("deploying component", "service", serviceName, "component", compName)
+	desiredState := "running"
+	if !active {
+		desiredState = "stopped"
+	}
+
+	a.Logger.Info("deploying component", "service", serviceName, "component", compName, "desired", desiredState)
 
 	regComp := &registry.Component{
 		Name:         compName,
@@ -59,7 +65,7 @@ func (a *Agent) deployComponent(ctx context.Context, serviceName string, cs *mcp
 		Network:      cs.GetNetwork(),
 		UserSpec:     cs.GetUser(),
 		Restart:      cs.GetRestart(),
-		DesiredState: "running",
+		DesiredState: desiredState,
 		Version:      runtime.ExtractVersion(cs.GetImage()),
 		Ports:        cs.GetPorts(),
 		Volumes:      cs.GetVolumes(),