fix(ui): refresh trajectory artifact checks

apps/web/tests/code-mode-fixture.snapshot.ts

@@ -206,16 +206,15 @@ it('trajectory and waterfall surface the run_code sub-calls with real timing', a
   }, { timeout: 10_000 })
   const subCells = [...document.querySelectorAll('[data-kind="subtool"]')]
   expect({
-    // Three Sub cells nested under the run_code Tool cell, in dispatch order,
-    // each with a real +N.Ns own-duration off the start/settle pair (the
-    // fixture spaces every event 800ms apart — never the em dash).
+    // Three Subtool cells nested under the run_code Tool cell in dispatch
+    // order, each paired with its result preview.
     subCells: subCells.map(cell => visibleText(cell)),
   }).toMatchInlineSnapshot(`
     {
       "subCells": [
-        "#51Subbash · {"command":"ls notes","description":"List notes"}+0.8s",
-        "#52Subread · {"path":"notes/demo.txt"}+0.8s",
-        "#53Subread · {"path":"notes/missing.txt"}+0.8s",
+        "SUBTOOLbash{"command":"ls notes","description":"List notes"}→demo.txt new-demo.txt",
+        "SUBTOOLread{"path":"notes/demo.txt"}→hello fixture",
+        "SUBTOOLread{"path":"notes/missing.txt"}→error",
       ],
     }
   `)
@@ -239,17 +238,17 @@ it('trajectory and waterfall surface the run_code sub-calls with real timing', a
         {
           "label": "bash",
           "timing": "measured",
-          "title": "bash · 0.80s",
+          "title": "bash · 0.80 s",
         },
         {
           "label": "read",
           "timing": "measured",
-          "title": "read · 0.80s",
+          "title": "read · 0.80 s",
         },
         {
           "label": "read",
           "timing": "measured",
-          "title": "read · 0.80s",
+          "title": "read · 0.80 s",
         },
       ],
     }

packages/client/runtime/src/client/sessions/fold-adapter.ts

@@ -196,23 +196,9 @@ export class FoldAdapter {
     }
     const out: ConversationNode[] = []
     for (const seq of seqs) {
-      const cached = this.nodeCache.get(seq)
-      if (cached !== undefined) {
-        out.push(cached)
-        continue
-      }
-      const event = this.padded[seq]
-      /* v8 ignore next -- sparse guard: both seq sources (surface fold and degradedSeqs) only emit indexes present in padded. */
-      if (event === undefined) continue
-      const node = materializeNode(
-        event,
-        this.callIdx,
-        this.resultViews.get(seq) ?? null,
-        event.type === 'assistant/message' ? this.assistantTiming(event) : undefined,
-        event.type === 'assistant/message' ? this.assistantRequestConfig(event) : undefined,
-      )
-      this.nodeCache.set(seq, node)
-      out.push(node)
+      const node = this.materialize(seq)
+      /* v8 ignore next -- both seq sources only emit indexes present in padded. */
+      if (node !== undefined) out.push(node)
     }
     const value = { nodes: out, degraded: this.degraded }
     this.nodesResult = { rev: this.rev, value }

packages/client/ui-trajectory/src/client/layout.ts

@@ -68,6 +68,11 @@ interface TurnBucket {
   groups: LaidGroup[]
 }
 
+type InputNode = Extract<
+  ConversationSnapshot['nodes'][number],
+  { kind: 'user' | 'steering' | 'context' }
+>
+
 type OrderedLayoutEntry =
   | {
     kind: 'node'
@@ -97,6 +102,21 @@ function layoutEntryOrder(entry: OrderedLayoutEntry): number {
     : entry.seq
 }
 
+function inputCellDetail(node: InputNode): Pick<
+  TrajectoryCellProps,
+  'text' | 'sourceSeq' | 'messageSource' | 'inputDetail' | 'sourceBlocks' | 'timeSeconds' | 'startedAt'
+> {
+  return {
+    text: summarizeContent(node.content),
+    sourceSeq: node.seq,
+    messageSource: node.source,
+    inputDetail: detailContent(node.content),
+    sourceBlocks: node.content.map(block => sourceBlock(block)),
+    timeSeconds: 0,
+    startedAt: finiteTime(node.time),
+  }
+}
+
 /**
  * Fold a snapshot into turn → Message/Step groups with expanded cells.
  * @param input - nodes plus in-flight partial/runningCalls.
@@ -294,15 +314,11 @@ export function deriveTrajectoryLayout(input: TrajectoryLayoutInput): readonly T
       pushMessage(turn, {
         absTime: finiteTime(node.time),
         cell: {
-          index: ++index, kind: 'user', text: summarizeContent(node.content),
-          sourceSeq: node.seq,
-          messageSource: node.source,
+          index: ++index,
+          kind: 'user',
+          ...inputCellDetail(node),
           ...(node.meta === undefined ? {} : { messageMeta: node.meta }),
           opensTurn: node.kind === 'user',
-          inputDetail: detailContent(node.content),
-          sourceBlocks: node.content.map(block => sourceBlock(block)),
-          timeSeconds: 0,
-          startedAt: finiteTime(node.time),
         },
       })
       prevAbsTime = finiteTime(node.time) ?? prevAbsTime
@@ -328,13 +344,7 @@ export function deriveTrajectoryLayout(input: TrajectoryLayoutInput): readonly T
         cell: {
           index: ++index,
           kind: 'context',
-          text: summarizeContent(node.content),
-          sourceSeq: node.seq,
-          messageSource: node.source,
-          inputDetail: detailContent(node.content),
-          sourceBlocks: node.content.map(block => sourceBlock(block)),
-          timeSeconds: 0,
-          startedAt: finiteTime(node.time),
+          ...inputCellDetail(node),
         },
       })
       prevAbsTime = finiteTime(node.time) ?? prevAbsTime