chore: code-review cleanup on today's shipped PRs

Three nits identified during post-merge review of #1119, #1133:

1. ContextMenu.tsx imported `removeNode` from the canvas store but
   stopped using it when the delete-confirm flow moved to Canvas in
   #1133. Also removed the now-unused mock entry in the keyboard
   test so the test inventory matches the real call list.

2. Preflight's YAML parse failure was a silent pass — defensible since
   the in-container preflight owns the schema, but invisible to ops if
   a template ships malformed YAML. Log at WARN so the signal surfaces
   without blocking the provision.

3. formatMissingEnvError rendered its slice via %q, producing
   `["A" "B"]` which is Go-literal-looking and ugly in a user-facing
   error. Join with ", " instead. Test updated to assert the new
   format.

No behavioural changes beyond the log line; fixes are review nits, not
bug fixes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

canvas/src/components/ContextMenu.tsx

@@ -18,7 +18,6 @@ interface MenuItem {
 export function ContextMenu() {
   const contextMenu = useCanvasStore((s) => s.contextMenu);
   const closeContextMenu = useCanvasStore((s) => s.closeContextMenu);
-  const removeNode = useCanvasStore((s) => s.removeNode);
   const updateNodeData = useCanvasStore((s) => s.updateNodeData);
   const selectNode = useCanvasStore((s) => s.selectNode);
   const setPanelTab = useCanvasStore((s) => s.setPanelTab);

canvas/src/components/__tests__/ContextMenu.keyboard.test.tsx

@@ -40,7 +40,6 @@ const mockStore = {
     nodeData: Record<string, unknown>;
   } | null,
   closeContextMenu,
-  removeNode: vi.fn(),
   updateNodeData: vi.fn(),
   selectNode: vi.fn(),
   setPanelTab: vi.fn(),

workspace-server/internal/handlers/workspace_preflight.go

@@ -2,6 +2,8 @@ package handlers
 
 import (
 	"fmt"
+	"log"
+	"strings"
 
 	"gopkg.in/yaml.v3"
 )
@@ -39,6 +41,11 @@ func missingRequiredEnv(configFiles map[string][]byte, envVars map[string]string
 	}
 	var schema requiredEnvSchema
 	if err := yaml.Unmarshal(raw, &schema); err != nil {
+		// Safe default: the in-container preflight is the source of truth
+		// for config.yaml shape, so we don't block the provision here. But
+		// log at WARN so operators can notice a template with malformed
+		// YAML — otherwise a silently-skipped preflight is invisible.
+		log.Printf("Preflight: WARN — config.yaml unparseable, skipping required_env check: %v", err)
 		return nil
 	}
 	if len(schema.RuntimeConfig.RequiredEnv) == 0 {
@@ -64,7 +71,7 @@ func formatMissingEnvError(missing []string) string {
 		)
 	}
 	return fmt.Sprintf(
-		"missing required env vars %q — add them under Config → Env Vars (or as Global secrets) and retry",
-		missing,
+		"missing required env vars %s — add them under Config → Env Vars (or as Global secrets) and retry",
+		strings.Join(missing, ", "),
 	)
 }

workspace-server/internal/handlers/workspace_preflight_test.go

@@ -117,8 +117,8 @@ func TestFormatMissingEnvError_Single(t *testing.T) {
 }
 
 func TestFormatMissingEnvError_Multiple(t *testing.T) {
-	msg := formatMissingEnvError([]string{"A", "B"})
-	if !strings.Contains(msg, "A") || !strings.Contains(msg, "B") {
-		t.Errorf("message should name both vars: %q", msg)
+	msg := formatMissingEnvError([]string{"FOO", "BAR"})
+	if !strings.Contains(msg, "FOO, BAR") {
+		t.Errorf("multi-var message should join with ', ' — got %q", msg)
 	}
 }