fix: address review findings - transitions, spec wording, dead fallback

web/apps/console/src/presentation/SceneBody.tsx

@@ -85,7 +85,7 @@ const PositioningScene = ({ scene, beat }: { scene: SceneDefinition; beat: Scene
         >
           <span className="scene-body__positioning-label">This thesis</span>
           <strong>lda.chat</strong>
-          <p>Typed workflow substrate for external agents and human operators.</p>
+          <p>Typed lifecycle substrate for external agents and human operators.</p>
           <ul>
             <li>Lifecycle</li>
             <li>Validation</li>
@@ -139,7 +139,7 @@ const BoundaryScene = ({ scene, beat }: { scene: SceneDefinition; beat: SceneBea
           <ul>
             <li>Proposes workflow structure</li>
             <li>Revises steps and bindings</li>
-            <li>Chooses public operations</li>
+            <li>Chooses tools</li>
           </ul>
         </section>
         <div className="scene-body__boundary-seam" aria-label="workflow operation boundary">
@@ -156,7 +156,8 @@ const BoundaryScene = ({ scene, beat }: { scene: SceneDefinition; beat: SceneBea
           <ul>
             <li>Validates schemas and routes</li>
             <li>Executes deterministic nodes</li>
-            <li>Records traces and resume state</li>
+            <li>Records traces and run output</li>
+            <li>Resumes from persisted state</li>
           </ul>
         </section>
       </div>
@@ -174,7 +175,7 @@ const lifecycleStages = [
 
 const LifecycleScene = ({ scene, beat }: { scene: SceneDefinition; beat: SceneBeatDefinition }) => {
   const activeIndex = Math.max(0, lifecycleStages.findIndex((stage) => stage.id === beat.id));
-  const activeStage = lifecycleStages[activeIndex] ?? lifecycleStages[0];
+  const activeStage = lifecycleStages[activeIndex]!;
   return (
     <>
       <StageCaption eyebrow="Act II · implemented" title={scene.title}>

web/apps/console/src/presentation/presentation.css

@@ -751,6 +751,11 @@
   opacity: 0.58;
 }
 
+.scene-body__positioning-tile,
+.scene-body__positioning-substrate {
+  transition: opacity 0.25s ease, transform 0.25s ease, border-color 0.2s ease, background 0.2s ease;
+}
+
 .scene-body__positioning-substrate[data-positioning-active="true"] {
   transform: translateY(-0.25rem);
   border-color: color-mix(in oklch, var(--accent-cyan, oklch(0.7 0.16 195)) 68%, transparent);
@@ -781,6 +786,10 @@
   opacity: 0.58;
 }
 
+.scene-body__boundary-pane {
+  transition: opacity 0.25s ease, transform 0.25s ease, border-color 0.2s ease, background 0.2s ease;
+}
+
 .scene-body__boundary-pane h3 {
   margin: 0;
   color: var(--color-editorial-ink, oklch(0.19 0.015 65));
@@ -851,6 +860,10 @@
   opacity: 0.68;
 }
 
+.scene-body__lifecycle-stage {
+  transition: opacity 0.25s ease, transform 0.25s ease, border-color 0.2s ease, background 0.2s ease;
+}
+
 .scene-body__lifecycle-stage[data-lifecycle-active="true"] {
   opacity: 1;
   transform: translateY(-0.25rem);