Build modules: steps end by compare-and-set; pin the sdk head with the review's fixes (issue 1890)

modules/mesh-build-node/cmd/mesh-build-node/asks.go

@@ -80,5 +80,5 @@ const StepEndTool = "build_node_step_end"
 
 // stepScan is the module's steps state as buildstep reads it.
 func (m *Module) stepScan() buildstep.Scan {
-	return buildstep.Scan{Keys: m.ReadSteps.Keys, Get: m.ReadSteps.Get}
+	return buildstep.ScanOf(stdio.State(delivery.StepsState))
 }

modules/mesh-build-node/cmd/mesh-build-node/main.go

@@ -76,7 +76,7 @@ func main() {
 	m.Held = puller
 	if m.Node != "" {
 		// A step a previous process left running is ended (issue 1890); this process's own steps start after booted.
-		go buildstep.EndStaleAtStart(ctx, m.stepScan(), m.Steps, m.Node, booted, logf)
+		go buildstep.EndStaleAtStart(ctx, m.stepScan(), m.Node, booted, logf)
 	}
 	if m.Node != "" {
 		// The seat's asks, pulled once Serve has the runtime's channel; a pull before it is said and tried again.

modules/mesh-build-node/cmd/mesh-build-node/tools.go

@@ -41,7 +41,7 @@ func (m *Module) Tools(steps []StepTool) []stdio.Tool {
 		tools = append(tools, t)
 	}
 	tools = append(tools, m.ReadTools()...)
-	tools = append(tools, buildstep.StepEndTool(StepEndTool, m.Node, m.stepScan(), m.Steps, m.Held))
+	tools = append(tools, buildstep.StepEndTool(StepEndTool, m.Node, m.stepScan(), m.Held))
 	tools = append(tools, m.releaseTool())
 	return append(tools,
 		stdio.Tool{Name: StatusTool,