Narrow filesystem provenance reads to the VM source type

The final-source controls passed 342 tests but type-check reported TS2339: WorkloadGuest also includes containers without diskStatusReason. Read the existing VM-only field after the local guest passes its type guard, preserving reactive identity and presentation. Record a fresh inspected browser pass on the corrected bytes; the earlier failed proof remains retained.

Change-source: pulse-maintainer
Contract-Neutral: Type-only correction to the existing VM-only provenance memo; no surface, contract or safety semantics change.

frontend-modern/browser-verification/6e9db582b2e6ffd4.json

@@ -0,0 +1,42 @@
+{
+  "version": 1,
+  "base_sha": "10f181b5007b4102340c779ae058d63958b0dd86",
+  "verified_at": "2026-10-04T01:59:40Z",
+  "result": "passed",
+  "changed_paths": [
+    "frontend-modern/src/components/Workloads/GuestRow.tsx"
+  ],
+  "content_sha256": {
+    "frontend-modern/src/components/Workloads/GuestRow.tsx": "a2a0763252b09cb859cd79ec358aa45deac3a3398ea98db3a66453d6659b5691"
+  },
+  "routes": [
+    "/browser-tests/guest-disk-provenance.html"
+  ],
+  "viewports": [
+    {
+      "width": 1365,
+      "height": 900
+    },
+    {
+      "width": 390,
+      "height": 844
+    },
+    {
+      "width": 360,
+      "height": 844
+    }
+  ],
+  "states": [
+    "Production GuestRow, full GuestDrawer, responsive column selection/weights and CSS; synthetic observations. Playwright 1.56.1 matches integration lock, desktop and phone Chromium 141.0.7390.37 plus dark phone WebKit 26.0. All 12 final bitmaps opened.",
+    "96 fixed-deferral states across bars/sparklines, retained/no prior sample, before hover: visible Last known/Prior versus Unavailable/N/A and full safe assistive reason. Retained numbers are announced last known, never current. Independent fresh control and CT rows remain unmarked.",
+    "Cue geometry and every inline sparkline value fit the existing canonical compact/phone/narrow columns, with 32px row height equal to an unmarked control and no horizontal document overflow. Inline plot yields width to its value; phone fresh 75% remains visible.",
+    "This verifies production component presentation/input, not a full application route, physical phone, collector, backup task completion, guest thaw/liveness, installed forward/recovery or containing release. Initial matrix success did not catch numeric clipping; its adverse visual finding and exact original records are retained separately.",
+    "After exact-source type-check failure TS2339, the memo narrows a local guest through the existing VM type guard before reading the VM-only reason. A fresh 96-state browser pass on that final hash was followed by opening all 12 final bitmaps. Earlier receipt remains unchanged and bound to its own parent."
+  ],
+  "interactions": [
+    "Mouse and keyboard history lenses preserve visible freshness and last-known accessible numeric context while replacing the bar with a chart. No new event listener, action or tab stop is introduced.",
+    "Trusted phone touch on the noninteractive provenance label activates the existing row exactly once, opens the full readable safe reason and does not create a hover history lens; existing collapse remains usable.",
+    "Clearing a VM lock with a subsequent in-flight read reason does not withdraw the notice. A new same-identity fresh observation clears title/notice, updates 75% and current accessible context without replacing the row node.",
+    "Guest fixtures make only local synthetic GET requests and report no page errors. No real backup, QGA or release operation is sent."
+  ]
+}

frontend-modern/src/components/Workloads/GuestRow.tsx

@@ -220,8 +220,9 @@ export function GuestRow(props: GuestRowProps) {
   // A native title or bar tooltip is not a visible freshness cue on touch,
   // and disappears from the chart's accessible value when the history lens opens.
   const diskReadStatus = createMemo(() => {
-    const reason = props.guest.diskStatusReason;
-    if (!isVM(props.guest) || !reason) return undefined;
+    const guest = props.guest;
+    if (!isVM(guest) || !guest.diskStatusReason) return undefined;
+    const reason = guest.diskStatusReason;
     const retained = reason.startsWith('prev-');
     return {
       label: retained