feat(atlas): Phase C — live Flux reconcile status on stage 07

Stage 07 now also shows the Flux `apps` Kustomization state — reconciled/failed
+ last-applied revision (main@shortsha) — read in-cluster (new read-only Role in
flux-system). Sits alongside the live deploy node. FluxStatus/FluxNode test-first,
fallback-safe.

Verified: build/vet/lint(0)/test green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/atlas/cluster.go

@@ -53,6 +53,70 @@ func HostsFromNodes(nodesJSON []byte) ([]Host, error) {
 	return hosts, nil
 }
 
+// Flux is the reconciliation state of a Flux Kustomization.
+type Flux struct {
+	Ready    bool
+	Reason   string
+	Revision string
+}
+
+// FluxStatus parses a Flux Kustomization object into its reconcile state.
+func FluxStatus(kustJSON []byte) (Flux, error) {
+	var k struct {
+		Status struct {
+			Conditions []struct {
+				Type   string `json:"type"`
+				Status string `json:"status"`
+				Reason string `json:"reason"`
+			} `json:"conditions"`
+			LastAppliedRevision string `json:"lastAppliedRevision"`
+		} `json:"status"`
+	}
+	if err := json.Unmarshal(kustJSON, &k); err != nil {
+		return Flux{}, fmt.Errorf("parse kustomization: %w", err)
+	}
+	f := Flux{Revision: shortRev(k.Status.LastAppliedRevision)}
+	for _, c := range k.Status.Conditions {
+		if c.Type == "Ready" {
+			f.Ready = c.Status == "True"
+			f.Reason = c.Reason
+		}
+	}
+	return f, nil
+}
+
+// FluxNode renders the Flux reconcile state as a stage node.
+func FluxNode(f Flux) Node {
+	if f.Ready {
+		return Node{
+			Title: "⟳ Flux · reconciled · " + f.Revision,
+			Pill:  "var(--green)",
+			Tags:  []string{"live · k8s"},
+		}
+	}
+	return Node{
+		Title: "⟳ Flux · " + f.Reason,
+		Pill:  "var(--coral)",
+		Tags:  []string{"live · k8s"},
+	}
+}
+
+// shortRev turns a Flux revision "main@sha1:<full>" into "main@<short>".
+func shortRev(rev string) string {
+	at := strings.Index(rev, "@")
+	if at < 0 {
+		return rev
+	}
+	branch, sha := rev[:at], rev[at+1:]
+	if c := strings.LastIndex(sha, ":"); c >= 0 {
+		sha = sha[c+1:]
+	}
+	if len(sha) > 7 {
+		sha = sha[:7]
+	}
+	return branch + "@" + sha
+}
+
 // Deploy is the live state of a Kubernetes Deployment.
 type Deploy struct {
 	Image   string

internal/atlas/cluster_test.go

@@ -98,6 +98,34 @@ func TestNamespaceSummary_CapsWithMore(t *testing.T) {
 	}
 }
 
+func TestFluxStatus_ParsesReadyReasonAndShortRevision(t *testing.T) {
+	k := []byte(`{"status":{
+	  "conditions":[{"type":"Ready","status":"True","reason":"ReconciliationSucceeded","message":"Applied revision: main@sha1:7a51d1d13944"}],
+	  "lastAppliedRevision":"main@sha1:7a51d1d13944c481b04fc434d9a2aca2a25632e4"}}`)
+
+	f, err := atlas.FluxStatus(k)
+	if err != nil {
+		t.Fatalf("FluxStatus: %v", err)
+	}
+	if !f.Ready || f.Reason != "ReconciliationSucceeded" || f.Revision != "main@7a51d1d" {
+		t.Fatalf("flux = %+v", f)
+	}
+}
+
+func TestFluxNode_GreenWhenReadyCoralWhenNot(t *testing.T) {
+	ready := atlas.FluxNode(atlas.Flux{Ready: true, Reason: "ReconciliationSucceeded", Revision: "main@7a51d1d"})
+	if ready.Pill != "var(--green)" {
+		t.Fatalf("ready pill = %q", ready.Pill)
+	}
+	if ready.Title != "⟳ Flux · reconciled · main@7a51d1d" {
+		t.Fatalf("title = %q", ready.Title)
+	}
+	notReady := atlas.FluxNode(atlas.Flux{Ready: false, Reason: "BuildFailed"})
+	if notReady.Pill != "var(--coral)" {
+		t.Fatalf("not-ready pill = %q", notReady.Pill)
+	}
+}
+
 func TestDeployState_ParsesImageAndReplicas(t *testing.T) {
 	dep := []byte(`{"spec":{"replicas":2,"template":{"spec":{"containers":[
 	  {"name":"cad-atlas","image":"localhost:5000/cad-atlas:3ff922a"}]}}},

internal/cluster/client.go

@@ -29,6 +29,12 @@ func Deployment() ([]byte, error) {
 	return get("/apis/apps/v1/namespaces/cad-atlas/deployments/cad-atlas")
 }
 
+// FluxKustomization returns the raw JSON for the Flux `apps` Kustomization that
+// reconciles this repo's manifests.
+func FluxKustomization() ([]byte, error) {
+	return get("/apis/kustomize.toolkit.fluxcd.io/v1/namespaces/flux-system/kustomizations/apps")
+}
+
 func get(path string) ([]byte, error) {
 	host, port := os.Getenv("KUBERNETES_SERVICE_HOST"), os.Getenv("KUBERNETES_SERVICE_PORT")
 	if host == "" || port == "" {

internal/web/handler.go

@@ -56,11 +56,17 @@ func NewHandler() http.Handler {
 				}
 			}
 		}
+		if ld.deploy != nil || ld.flux != nil {
+			var live []atlas.Node
 			if ld.deploy != nil {
-			node := atlas.DeployNode(*ld.deploy)
+				live = append(live, atlas.DeployNode(*ld.deploy))
+			}
+			if ld.flux != nil {
+				live = append(live, atlas.FluxNode(*ld.flux))
+			}
 			for i := range a.Stages {
 				if a.Stages[i].Generate == "deploy-state" {
-					a.Stages[i].Nodes = append([]atlas.Node{node}, a.Stages[i].Nodes...)
+					a.Stages[i].Nodes = append(live, a.Stages[i].Nodes...)
 				}
 			}
 		}
@@ -76,6 +82,7 @@ type liveOverlayData struct {
 	ns       string
 	run      *atlas.RunSummary
 	deploy   *atlas.Deploy
+	flux     *atlas.Flux
 	timeline []atlas.RunDot
 }
 
@@ -121,6 +128,11 @@ func liveOverlay() liveOverlayData {
 			d.deploy = &dep
 		}
 	}
+	if raw, err := cluster.FluxKustomization(); err == nil {
+		if f, err := atlas.FluxStatus(raw); err == nil {
+			d.flux = &f
+		}
+	}
 	liveCache = d
 	return d
 }