feat(breakglass): add halt-a-server op to the recovery console (§B4)

Add a root-gated "Halt a running server" operation to the break-glass
console. The operator picks a server from the live fleet and the console
flips that MinecraftServer CRD's spec.desiredState to Stopped via a
spec-only merge patch, disjoint from the operator's status writes, so it
cannot race or clobber reconciliation. It is the panel-independent
emergency stop for when the box still has root plus a kubeconfig.

System servers (login/lobby) are allowed but flagged: a system tag in the
picker and an explicit WARNING in the post-exit summary, since halting
login takes the shared auth front door down with no fallback. Audit is
best-effort so a halt still works with the audit sink down. Already-stopped
is a distinct no-op. The core (halt.go) is unit-tested against a real
controller-runtime fake client that applies the patch.

cmd/felis/breakglass.go

@@ -146,13 +146,13 @@ func cmdBreakGlass(args []string, stdout, stderr io.Writer) int {
 		return 1
 	}
 
-	res, err := runBreakGlassTUI(ctx, repo, cfg.Database.URL, cfg.Server.RootDomain, cfg.Auth.AdminHostname, cfg.Auth.PanelHostname, cfg.Auth.AccessJWTAud, accountableOSUser(), adminExists)
+	res, err := runBreakGlassTUI(ctx, repo, cfg.Database.URL, cfg.Server.RootDomain, cfg.Auth.AdminHostname, cfg.Auth.PanelHostname, cfg.Auth.AccessJWTAud, cfg.K8s.Namespace, accountableOSUser(), adminExists)
 	if err != nil {
 		fmt.Fprintf(stderr, "felis breakGlass: %v\n", err)
 		return 1
 	}
 
-	if !res.provisioned && !res.edgeConfigured {
+	if !res.provisioned && !res.edgeConfigured && !res.halted {
 		fmt.Fprintln(stdout, "felis breakGlass: cancelled — no changes made.")
 		return 0
 	}
@@ -198,6 +198,23 @@ func cmdBreakGlass(args []string, stdout, stderr io.Writer) int {
 		fmt.Fprintln(stdout, "Then start the tunnel:  cloudflared tunnel run")
 		fmt.Fprintln(stdout, "Verify the Access app actually guards the admin face before relying on it.")
 	}
+
+	if res.halted {
+		verb := "is now stopping"
+		if res.haltAlreadyStopped {
+			verb = "was already stopped"
+		}
+		fmt.Fprintf(stdout, "\nfelis breakGlass: server %q %s (namespace %s).\n", res.haltServer, verb, res.haltNamespace)
+		if res.haltSystemServer {
+			// login has no fallback (systemservers.go): stopping it takes the whole proxy
+			// front door down, so the summary says so explicitly rather than burying it.
+			fmt.Fprintf(stdout, "WARNING: %q is a system server — the shared front door is down until it is running again.\n", res.haltServer)
+		}
+		if res.haltAuditWarning != "" {
+			fmt.Fprintf(stdout, "WARNING: the accountability audit row was NOT written: %s\n", res.haltAuditWarning)
+		}
+		fmt.Fprintf(stdout, "Restart it from the panel, or set the MinecraftServer's spec.desiredState back to Running.\n")
+	}
 	return 0
 }
 
@@ -491,6 +508,14 @@ type breakGlassResult struct {
 	storageMethod storageMethod
 	storageDetail string
 
+	// halt outcome (break-glass "halt a server" op #31)
+	halted             bool
+	haltServer         string
+	haltNamespace      string
+	haltAlreadyStopped bool
+	haltSystemServer   bool
+	haltAuditWarning   string
+
 	// Cloudflare-specific edge detail (set only when connectMethod is Cloudflare)
 	edgeConfigured    bool
 	edgeAud           string
@@ -518,16 +543,16 @@ const (
 	cloudflareAPITokenDocsURL        = "https://developers.cloudflare.com/fundamentals/api/how-to/account-owned-token-template/"
 )
 
-func runBreakGlassTUI(ctx context.Context, s ownerStore, dbURL, rootDomain, adminHostname, panelHostname, accessAud, osUser string, adminExists bool) (breakGlassResult, error) {
+func runBreakGlassTUI(ctx context.Context, s ownerStore, dbURL, rootDomain, adminHostname, panelHostname, accessAud, namespace, osUser string, adminExists bool) (breakGlassResult, error) {
-	return runConsoleTUI(ctx, s, dbURL, rootDomain, adminHostname, panelHostname, accessAud, osUser, adminExists, consoleModeBreakGlass)
+	return runConsoleTUI(ctx, s, dbURL, rootDomain, adminHostname, panelHostname, accessAud, namespace, osUser, adminExists, consoleModeBreakGlass)
 }
 
-func runSetupTUI(ctx context.Context, s ownerStore, dbURL, rootDomain, adminHostname, panelHostname, accessAud, osUser string, adminExists bool) (breakGlassResult, error) {
+func runSetupTUI(ctx context.Context, s ownerStore, dbURL, rootDomain, adminHostname, panelHostname, accessAud, namespace, osUser string, adminExists bool) (breakGlassResult, error) {
-	return runConsoleTUI(ctx, s, dbURL, rootDomain, adminHostname, panelHostname, accessAud, osUser, adminExists, consoleModeSetup)
+	return runConsoleTUI(ctx, s, dbURL, rootDomain, adminHostname, panelHostname, accessAud, namespace, osUser, adminExists, consoleModeSetup)
 }
 
-func runConsoleTUI(ctx context.Context, s ownerStore, dbURL, rootDomain, adminHostname, panelHostname, accessAud, osUser string, adminExists bool, mode consoleMode) (breakGlassResult, error) {
+func runConsoleTUI(ctx context.Context, s ownerStore, dbURL, rootDomain, adminHostname, panelHostname, accessAud, namespace, osUser string, adminExists bool, mode consoleMode) (breakGlassResult, error) {
-	rm := newRootModel(ctx, s, dbURL, rootDomain, adminHostname, panelHostname, accessAud, osUser, adminExists, mode)
+	rm := newRootModel(ctx, s, dbURL, rootDomain, adminHostname, panelHostname, accessAud, namespace, osUser, adminExists, mode)
 	final, err := tea.NewProgram(rm, tea.WithAltScreen()).Run()
 	if err != nil {
 		return breakGlassResult{}, err

cmd/felis/halt.go

@@ -0,0 +1,139 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"felis.lolicon.best/internal/api"
+	"felis.lolicon.best/internal/apis/felis/v1alpha1"
+	"felis.lolicon.best/internal/naming"
+
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+// halt is the break-glass "stop a running server now" op (#31). Its authority is
+// the same as the rest of the console: local root holding the cluster kubeconfig.
+// The console does not stop the pod itself — it flips the MinecraftServer's desired
+// state to Stopped and lets the operator reconcile that into a graceful shutdown, so
+// a halt is exactly the CRD write the operator already knows how to honour.
+//
+// This file is the pure core — no bubbletea, no huh — so the whole thing is unit
+// tested against a controller-runtime fake client. The TUI shell lives in
+// tui_halt.go and only calls into here.
+
+// haltableServer is a MinecraftServer projected down to what the halt picker shows:
+// its name, its observed phase (or desired state before the operator has reconciled
+// it), and whether it is a platform system server whose halt takes the front door
+// down.
+type haltableServer struct {
+	name   string
+	phase  string
+	system bool
+}
+
+// haltOutcome is the durable result of a halt attempt, surfaced in the TUI card and
+// re-printed to the normal screen after the alt-screen tears down.
+type haltOutcome struct {
+	name           string
+	namespace      string
+	alreadyStopped bool
+	system         bool  // login/lobby — halting these takes the auth front door down
+	auditErr       error // non-nil if the accountability row could not be written
+}
+
+// listServersForHalt lists the MinecraftServers an operator may halt in the given
+// namespace, projecting only what the picker renders. The phase falls back to the
+// desired state for a server the operator has not yet reconciled (empty status).
+func listServersForHalt(ctx context.Context, cl client.Client, namespace string) ([]haltableServer, error) {
+	var list v1alpha1.MinecraftServerList
+	if err := cl.List(ctx, &list, client.InNamespace(namespace)); err != nil {
+		return nil, err
+	}
+	out := make([]haltableServer, 0, len(list.Items))
+	for i := range list.Items {
+		ms := &list.Items[i]
+		phase := string(ms.Status.Phase)
+		if phase == "" {
+			phase = string(ms.Spec.DesiredState) // not yet reconciled — show intent
+		}
+		out = append(out, haltableServer{
+			name:   ms.Name,
+			phase:  phase,
+			system: isSystemServer(ms.Name),
+		})
+	}
+	return out, nil
+}
+
+// haltServer flips one MinecraftServer's desiredState to Stopped with a spec-only
+// merge patch. MergeFrom (not Update) is deliberate: the operator writes status on
+// the same object continuously, and a full-object Update would race and clobber it,
+// whereas a merge patch of spec.desiredState touches a disjoint field. Halting a
+// server already Stopped is a no-op, reported via alreadyStopped so the console can
+// say "already stopped" instead of claiming it just stopped it.
+func haltServer(ctx context.Context, cl client.Client, namespace, name string) (haltOutcome, error) {
+	var ms v1alpha1.MinecraftServer
+	if err := cl.Get(ctx, types.NamespacedName{Namespace: namespace, Name: name}, &ms); err != nil {
+		if apierrors.IsNotFound(err) {
+			return haltOutcome{}, fmt.Errorf("no MinecraftServer %q in namespace %q", name, namespace)
+		}
+		return haltOutcome{}, fmt.Errorf("get server %q: %w", name, err)
+	}
+	out := haltOutcome{name: name, namespace: namespace, system: isSystemServer(name)}
+	if ms.Spec.DesiredState == v1alpha1.DesiredStopped {
+		out.alreadyStopped = true
+		return out, nil
+	}
+	patch := client.MergeFrom(ms.DeepCopy())
+	ms.Spec.DesiredState = v1alpha1.DesiredStopped
+	if err := cl.Patch(ctx, &ms, patch); err != nil {
+		return haltOutcome{}, fmt.Errorf("halt server %q: %w", name, err)
+	}
+	return out, nil
+}
+
+// isSystemServer reports whether name is a platform-provisioned system server. The
+// login gate has no fallback (systemservers.go), so halting it locks every player
+// out of the whole proxy — the console warns when the target is one rather than
+// forbidding it, since break-glass is deliberately full power.
+func isSystemServer(name string) bool {
+	return name == naming.SystemLoginServer || name == naming.SystemLobbyServer
+}
+
+// performHalt runs haltServer and records a best-effort accountability audit row. It
+// mirrors performBreakGlass: the halt succeeds even when the audit sink is unhappy
+// (break-glass must work with logging down), and any audit error rides back in the
+// outcome for the console to surface. accountable is the OS user who escalated to
+// root — attribution, not proof (the root gate is the real authority).
+func performHalt(ctx context.Context, cl client.Client, s ownerStore, namespace, name, accountable string) (haltOutcome, error) {
+	out, err := haltServer(ctx, cl, namespace, name)
+	if err != nil {
+		return haltOutcome{}, err
+	}
+	out.auditErr = auditHalt(ctx, s, out, accountable)
+	return out, nil
+}
+
+// auditHalt writes the halt accountability row under the break_glass.halt action,
+// recording who halted what and whether it was a no-op or a system server.
+func auditHalt(ctx context.Context, s ownerStore, out haltOutcome, accountable string) error {
+	blob, err := json.Marshal(map[string]any{
+		"server":          out.name,
+		"namespace":       out.namespace,
+		"os_user":         accountable,
+		"already_stopped": out.alreadyStopped,
+		"system_server":   out.system,
+	})
+	if err != nil {
+		return err
+	}
+	return s.Audit(ctx, api.AuditEntry{
+		Actor:   accountable,
+		Source:  "break-glass",
+		Action:  "break_glass.halt",
+		Payload: blob,
+	})
+}

cmd/felis/halt_test.go

@@ -0,0 +1,179 @@
+package main
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"felis.lolicon.best/internal/apis/felis/v1alpha1"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
+	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/client/fake"
+)
+
+const haltNS = "minecraft"
+
+func haltScheme(t *testing.T) *runtime.Scheme {
+	t.Helper()
+	scheme := runtime.NewScheme()
+	if err := clientgoscheme.AddToScheme(scheme); err != nil {
+		t.Fatalf("clientgo scheme: %v", err)
+	}
+	if err := v1alpha1.AddToScheme(scheme); err != nil {
+		t.Fatalf("v1alpha1 scheme: %v", err)
+	}
+	return scheme
+}
+
+func mcServer(name string, desired v1alpha1.DesiredState, phase v1alpha1.Phase) *v1alpha1.MinecraftServer {
+	return &v1alpha1.MinecraftServer{
+		ObjectMeta: metav1.ObjectMeta{Name: name, Namespace: haltNS},
+		Spec:       v1alpha1.MinecraftServerSpec{DesiredState: desired},
+		Status:     v1alpha1.MinecraftServerStatus{Phase: phase},
+	}
+}
+
+func haltClient(t *testing.T, objs ...client.Object) client.Client {
+	t.Helper()
+	return fake.NewClientBuilder().WithScheme(haltScheme(t)).WithObjects(objs...).Build()
+}
+
+// desiredStateOf reads a server's spec.desiredState straight back from the client,
+// so the patch is verified by its actual persisted effect, not by "Patch was called".
+func desiredStateOf(t *testing.T, cl client.Client, name string) v1alpha1.DesiredState {
+	t.Helper()
+	var ms v1alpha1.MinecraftServer
+	if err := cl.Get(context.Background(), types.NamespacedName{Namespace: haltNS, Name: name}, &ms); err != nil {
+		t.Fatalf("get %q back: %v", name, err)
+	}
+	return ms.Spec.DesiredState
+}
+
+func TestHaltServer(t *testing.T) {
+	ctx := context.Background()
+
+	t.Run("running server is patched to Stopped", func(t *testing.T) {
+		cl := haltClient(t, mcServer("survival", v1alpha1.DesiredRunning, v1alpha1.PhaseRunning))
+		out, err := haltServer(ctx, cl, haltNS, "survival")
+		if err != nil {
+			t.Fatalf("haltServer: %v", err)
+		}
+		if out.alreadyStopped {
+			t.Error("alreadyStopped = true, want false for a running server")
+		}
+		if got := desiredStateOf(t, cl, "survival"); got != v1alpha1.DesiredStopped {
+			t.Errorf("desiredState after halt = %q, want Stopped", got)
+		}
+	})
+
+	t.Run("already-stopped server is a reported no-op", func(t *testing.T) {
+		cl := haltClient(t, mcServer("survival", v1alpha1.DesiredStopped, v1alpha1.PhaseStopped))
+		out, err := haltServer(ctx, cl, haltNS, "survival")
+		if err != nil {
+			t.Fatalf("haltServer: %v", err)
+		}
+		if !out.alreadyStopped {
+			t.Error("alreadyStopped = false, want true for an already-stopped server")
+		}
+		if got := desiredStateOf(t, cl, "survival"); got != v1alpha1.DesiredStopped {
+			t.Errorf("desiredState = %q, want it left Stopped", got)
+		}
+	})
+
+	t.Run("missing server is a clear error, not a patch", func(t *testing.T) {
+		cl := haltClient(t)
+		_, err := haltServer(ctx, cl, haltNS, "ghost")
+		if err == nil {
+			t.Fatal("haltServer(ghost) = nil error, want not-found error")
+		}
+		if !strings.Contains(err.Error(), "ghost") {
+			t.Errorf("error %q does not name the missing server", err)
+		}
+	})
+
+	t.Run("halting login is allowed and flagged a system server", func(t *testing.T) {
+		cl := haltClient(t, mcServer("login", v1alpha1.DesiredRunning, v1alpha1.PhaseRunning))
+		out, err := haltServer(ctx, cl, haltNS, "login")
+		if err != nil {
+			t.Fatalf("haltServer(login): %v", err)
+		}
+		if !out.system {
+			t.Error("system = false, want true for the login front-door server")
+		}
+		if got := desiredStateOf(t, cl, "login"); got != v1alpha1.DesiredStopped {
+			t.Errorf("desiredState after halt = %q, want Stopped", got)
+		}
+	})
+}
+
+func TestListServersForHalt(t *testing.T) {
+	cl := haltClient(t,
+		mcServer("survival", v1alpha1.DesiredRunning, ""), // no status yet → phase falls back to intent
+		mcServer("login", v1alpha1.DesiredRunning, ""),
+	)
+	got, err := listServersForHalt(context.Background(), cl, haltNS)
+	if err != nil {
+		t.Fatalf("listServersForHalt: %v", err)
+	}
+	if len(got) != 2 {
+		t.Fatalf("listed %d servers, want 2", len(got))
+	}
+	by := map[string]haltableServer{}
+	for _, s := range got {
+		by[s.name] = s
+	}
+	if s := by["survival"]; s.system || s.phase != "Running" {
+		t.Errorf("survival projected %+v, want system=false phase=Running (desired-state fallback)", s)
+	}
+	if s := by["login"]; !s.system {
+		t.Errorf("login projected system=false, want true")
+	}
+}
+
+func TestPerformHalt(t *testing.T) {
+	ctx := context.Background()
+
+	t.Run("halts and records an accountability audit row", func(t *testing.T) {
+		cl := haltClient(t, mcServer("survival", v1alpha1.DesiredRunning, v1alpha1.PhaseRunning))
+		f := &fakeOwnerStore{}
+		out, err := performHalt(ctx, cl, f, haltNS, "survival", "deploybot")
+		if err != nil {
+			t.Fatalf("performHalt: %v", err)
+		}
+		if out.auditErr != nil {
+			t.Errorf("auditErr = %v, want nil", out.auditErr)
+		}
+		if got := desiredStateOf(t, cl, "survival"); got != v1alpha1.DesiredStopped {
+			t.Errorf("desiredState after performHalt = %q, want Stopped", got)
+		}
+		e, payload := auditOf(t, f)
+		if e.Action != "break_glass.halt" {
+			t.Errorf("audit action = %q, want break_glass.halt", e.Action)
+		}
+		if e.Actor != "deploybot" {
+			t.Errorf("audit actor = %q, want deploybot", e.Actor)
+		}
+		if payload["server"] != "survival" || payload["system_server"] != false {
+			t.Errorf("audit payload = %v, want server=survival system_server=false", payload)
+		}
+	})
+
+	t.Run("a failed audit sink does not fail the halt", func(t *testing.T) {
+		cl := haltClient(t, mcServer("survival", v1alpha1.DesiredRunning, v1alpha1.PhaseRunning))
+		f := &fakeOwnerStore{auditErr: context.DeadlineExceeded}
+		out, err := performHalt(ctx, cl, f, haltNS, "survival", "deploybot")
+		if err != nil {
+			t.Fatalf("performHalt returned error on audit failure, want halt to still succeed: %v", err)
+		}
+		if out.auditErr == nil {
+			t.Error("auditErr = nil, want the sink failure surfaced")
+		}
+		if got := desiredStateOf(t, cl, "survival"); got != v1alpha1.DesiredStopped {
+			t.Errorf("desiredState = %q, want Stopped even though the audit failed", got)
+		}
+	})
+}

cmd/felis/setup.go

@@ -102,7 +102,7 @@ func cmdSetup(args []string, stdout, stderr io.Writer) int {
 	}
 	defer setup.drv.Close()
 
-	res, err := runSetupTUI(ctx, setup.repo, setup.cfg.Database.URL, setup.cfg.Server.RootDomain, setup.cfg.Auth.AdminHostname, setup.cfg.Auth.PanelHostname, setup.cfg.Auth.AccessJWTAud, accountableOSUser(), setup.adminExists)
+	res, err := runSetupTUI(ctx, setup.repo, setup.cfg.Database.URL, setup.cfg.Server.RootDomain, setup.cfg.Auth.AdminHostname, setup.cfg.Auth.PanelHostname, setup.cfg.Auth.AccessJWTAud, setup.cfg.K8s.Namespace, accountableOSUser(), setup.adminExists)
 	if err != nil {
 		fmt.Fprintf(stderr, "felis setup: %v\n", err)
 		return 1

cmd/felis/tui_halt.go

@@ -0,0 +1,268 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/charmbracelet/bubbles/spinner"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/huh"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+)
+
+// haltModel is the break-glass "halt a server" screen. It mirrors ownerModel's
+// shape (async load → huh pick → async work → outcome card) but carries no auth
+// branch: the console's root gate is the authority, and the accountable OS user is
+// already known. All decision logic lives in halt.go (unit-tested); this file is the
+// untested terminal glue, like the other console screens.
+type haltStep int
+
+const (
+	haltLoading haltStep = iota // building the cluster client + listing servers
+	haltPick                    // choosing which server to halt
+	haltWorking                 // patching desiredState=Stopped
+	haltDone                    // outcome card, or the empty/error terminal note
+)
+
+// haltListMsg carries the built cluster client and haltable server list (or the
+// failure of either) back from the async load.
+type haltListMsg struct {
+	cl      client.Client
+	servers []haltableServer
+	err     error
+}
+
+type haltPerformedMsg struct {
+	outcome haltOutcome
+	err     error
+}
+
+// haltResultMsg is the terminal signal to the root: it records the outcome into
+// breakGlassResult and quits, so cmdBreakGlass can re-print it after the alt-screen
+// is torn down. done is false for a cancel or an empty fleet (no change made).
+type haltResultMsg struct {
+	outcome haltOutcome
+	done    bool
+	err     error
+}
+
+type haltModel struct {
+	ctx       context.Context
+	store     ownerStore
+	namespace string
+	osUser    string
+
+	step haltStep
+	cl   client.Client
+	sp   spinner.Model
+	form *huh.Form
+
+	servers []haltableServer
+	pick    string // huh-bound selected server name
+	outcome haltOutcome
+	loadErr error
+	empty   bool
+
+	width, height int
+}
+
+func newHaltModel(ctx context.Context, store ownerStore, namespace, osUser string) *haltModel {
+	sp := spinner.New()
+	sp.Spinner = spinner.Dot
+	sp.Style = tuiLabel
+	return &haltModel{ctx: ctx, store: store, namespace: namespace, osUser: osUser, sp: sp, step: haltLoading}
+}
+
+func (m *haltModel) Init() tea.Cmd { return tea.Batch(m.sp.Tick, m.loadCmd()) }
+
+// loadCmd builds the cluster client and lists haltable servers off the UI thread.
+// The client build (no kubeconfig) and the list (no API) can each fail; either
+// becomes the screen's terminal error rather than a panic.
+func (m *haltModel) loadCmd() tea.Cmd {
+	return func() tea.Msg {
+		cl, err := buildSystemServerClient()
+		if err != nil {
+			return haltListMsg{err: fmt.Errorf("connect to cluster: %w", err)}
+		}
+		servers, err := listServersForHalt(m.ctx, cl, m.namespace)
+		if err != nil {
+			return haltListMsg{err: fmt.Errorf("list servers: %w", err)}
+		}
+		return haltListMsg{cl: cl, servers: servers}
+	}
+}
+
+func (m *haltModel) setSize(w, h int) {
+	m.width, m.height = w, h
+	if m.form != nil {
+		m.form = m.form.WithWidth(w).WithHeight(h)
+	}
+}
+
+func (m *haltModel) sized(f *huh.Form) *huh.Form {
+	if m.width > 0 {
+		return f.WithWidth(m.width).WithHeight(m.height)
+	}
+	return f
+}
+
+func (m *haltModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case haltListMsg:
+		if msg.err != nil {
+			m.loadErr = msg.err
+			m.step = haltDone
+			return m, nil
+		}
+		m.cl = msg.cl
+		m.servers = msg.servers
+		if len(m.servers) == 0 {
+			m.empty = true
+			m.step = haltDone
+			return m, nil
+		}
+		m.step = haltPick
+		m.form = m.sized(m.buildPickForm())
+		return m, m.form.Init()
+
+	case haltPerformedMsg:
+		m.step = haltDone
+		if msg.err != nil {
+			m.loadErr = msg.err
+			return m, nil
+		}
+		m.outcome = msg.outcome
+		return m, nil
+
+	case spinner.TickMsg:
+		if m.step == haltLoading || m.step == haltWorking {
+			var cmd tea.Cmd
+			m.sp, cmd = m.sp.Update(msg)
+			return m, cmd
+		}
+		return m, nil
+
+	case tea.KeyMsg:
+		switch m.step {
+		case haltDone:
+			switch msg.String() {
+			case "ctrl+c", "esc", "enter":
+				return m, m.exitCmd()
+			}
+			return m, nil
+		case haltLoading, haltWorking:
+			if msg.String() == "ctrl+c" {
+				return m, tea.Quit
+			}
+			return m, nil
+		case haltPick:
+			switch msg.String() {
+			case "ctrl+c", "esc":
+				return m, tea.Quit
+			}
+		}
+	}
+
+	if m.step == haltPick && m.form != nil {
+		form, cmd := m.form.Update(msg)
+		if f, ok := form.(*huh.Form); ok {
+			m.form = f
+		}
+		switch m.form.State {
+		case huh.StateCompleted:
+			return m.onPicked()
+		case huh.StateAborted:
+			return m, tea.Quit
+		}
+		return m, cmd
+	}
+	return m, nil
+}
+
+func (m *haltModel) onPicked() (tea.Model, tea.Cmd) {
+	name := strings.TrimSpace(m.pick)
+	m.step = haltWorking
+	cl, ns, store, osUser := m.cl, m.namespace, m.store, m.osUser
+	return m, tea.Batch(m.sp.Tick, func() tea.Msg {
+		out, err := performHalt(m.ctx, cl, store, ns, name, osUser)
+		return haltPerformedMsg{outcome: out, err: err}
+	})
+}
+
+// exitCmd hands the outcome to the root: a load/perform error routes through the
+// root's error path, a real halt records the durable summary, and an empty fleet is
+// a benign cancel.
+func (m *haltModel) exitCmd() tea.Cmd {
+	out, done, err := m.outcome, !m.empty && m.loadErr == nil, m.loadErr
+	return func() tea.Msg { return haltResultMsg{outcome: out, done: done, err: err} }
+}
+
+func (m *haltModel) buildPickForm() *huh.Form {
+	opts := make([]huh.Option[string], 0, len(m.servers))
+	for _, s := range m.servers {
+		label := fmt.Sprintf("%s  (%s)", s.name, s.phase)
+		if s.system {
+			label += "  ⚠ system — front door"
+		}
+		opts = append(opts, huh.NewOption(label, s.name))
+	}
+	return m.sized(newFelisForm(huh.NewGroup(
+		huh.NewSelect[string]().
+			Title("Halt a server").
+			Description("Sets desiredState=Stopped; the operator reconciles a graceful shutdown.").
+			Value(&m.pick).
+			Options(opts...),
+		huh.NewNote().Description(
+			"Halting a ⚠ system server stops shared infrastructure: halting login takes "+
+				"the whole auth front door down (it has no fallback)."),
+	)))
+}
+
+func (m *haltModel) View() string {
+	switch m.step {
+	case haltLoading:
+		return "  " + m.sp.View() + " " + tuiHint.Render("Connecting to the cluster…") + "\n"
+	case haltWorking:
+		return "  " + m.sp.View() + " " + tuiHint.Render("Halting "+strings.TrimSpace(m.pick)+"…") + "\n"
+	case haltDone:
+		return m.doneView()
+	default:
+		if m.form == nil {
+			return ""
+		}
+		return m.form.View()
+	}
+}
+
+func (m *haltModel) doneView() string {
+	var b strings.Builder
+	switch {
+	case m.loadErr != nil:
+		b.WriteString(tuiWarn.Render("Halt failed.") + "\n\n")
+		b.WriteString(tuiCardStyle.Render(m.loadErr.Error()) + "\n\n")
+	case m.empty:
+		b.WriteString(tuiHint.Render("No servers to halt in namespace "+m.namespace+".") + "\n\n")
+	default:
+		b.WriteString(tuiSuccessBanner(haltHeadline(m.outcome)) + "\n\n")
+		var box strings.Builder
+		box.WriteString(tuiLabel.Render("server    ") + m.outcome.name + "\n")
+		box.WriteString(tuiLabel.Render("namespace ") + m.outcome.namespace)
+		if m.outcome.system {
+			box.WriteString("\n\n" + tuiWarn.Render("This is a system server — the shared front door is now going down."))
+		}
+		if m.outcome.auditErr != nil {
+			box.WriteString("\n\n" + tuiWarn.Render("Audit warning: "+m.outcome.auditErr.Error()))
+		}
+		b.WriteString(tuiCardStyle.Render(box.String()) + "\n\n")
+	}
+	b.WriteString(tuiAction("enter", "continue"))
+	return b.String()
+}
+
+func haltHeadline(out haltOutcome) string {
+	if out.alreadyStopped {
+		return out.name + " was already stopped."
+	}
+	return out.name + " is stopping."
+}

cmd/felis/tui_menu.go

@@ -14,6 +14,7 @@ type bgOperation int
 const (
 	bgProvisionOwner bgOperation = iota
 	bgAddOperator
+	bgHaltServer
 )
 
 // menuChoiceMsg is emitted to the root once the operator picks an operation. The
@@ -50,6 +51,7 @@ func (m *menuModel) build() *huh.Form {
 				// recovery flow, and landing on it keeps that path a single Enter.
 				huh.NewOption("Provision or reset the Owner account", bgProvisionOwner),
 				huh.NewOption("Add an Operator account", bgAddOperator),
+				huh.NewOption("Halt a running server", bgHaltServer),
 			),
 		// A dim footnote spelling out the one behavioural difference that matters:
 		// Owner-reset re-enables local-password login, operator-add never touches the

cmd/felis/tui_root.go

@@ -139,10 +139,11 @@ type rootModel struct {
 	adminHost   string
 	panelHost   string
 	accessAud   string
+	namespace   string // minecraft workload namespace (cfg.K8s.Namespace); target of the halt op
 	adminExists bool
 }
 
-func newRootModel(ctx context.Context, store ownerStore, dbURL, rootDomain, adminHostname, panelHostname, accessAud, osUser string, adminExists bool, mode consoleMode) *rootModel {
+func newRootModel(ctx context.Context, store ownerStore, dbURL, rootDomain, adminHostname, panelHostname, accessAud, namespace, osUser string, adminExists bool, mode consoleMode) *rootModel {
 	rm := &rootModel{
 		ctx:         ctx,
 		reviewing:   -1,
@@ -153,6 +154,7 @@ func newRootModel(ctx context.Context, store ownerStore, dbURL, rootDomain, admi
 		adminHost:   adminHostname,
 		panelHost:   panelHostname,
 		accessAud:   accessAud,
+		namespace:   namespace,
 		adminExists: adminExists,
 		mode:        mode,
 		result: breakGlassResult{
@@ -219,10 +221,33 @@ func (m *rootModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		switch msg.op {
 		case bgAddOperator:
 			return m.adopt(newOperatorModel(m.ctx, m.store, m.osUser))
+		case bgHaltServer:
+			return m.adopt(newHaltModel(m.ctx, m.store, m.namespace, m.osUser))
 		default:
 			return m.adopt(newOwnerModel(m.ctx, m.store, m.osUser, m.adminExists))
 		}
 
+	case haltResultMsg:
+		// Halt is terminal in break-glass: record the durable summary (so cmdBreakGlass
+		// can re-print it past the alt-screen teardown) and quit. A load/perform failure
+		// routes through the root's error path; an empty fleet or cancel leaves halted
+		// false, so the summary reports "no changes made".
+		if msg.err != nil {
+			m.err = msg.err
+			return m, tea.Quit
+		}
+		if msg.done {
+			m.result.halted = true
+			m.result.haltServer = msg.outcome.name
+			m.result.haltNamespace = msg.outcome.namespace
+			m.result.haltAlreadyStopped = msg.outcome.alreadyStopped
+			m.result.haltSystemServer = msg.outcome.system
+			if msg.outcome.auditErr != nil {
+				m.result.haltAuditWarning = msg.outcome.auditErr.Error()
+			}
+		}
+		return m, tea.Quit
+
 	case ownerResultMsg:
 		if msg.err != nil {
 			m.err = msg.err

cmd/felis/tui_root_test.go

@@ -35,6 +35,7 @@ func newTestRoot(adminExists bool, mode consoleMode, accessAud string) *rootMode
 		"admin.felis.example.com",
 		"panel.felis.example.com",
 		accessAud,
+		"minecraft",
 		"root",
 		adminExists,
 		mode,