Put the dual-bay sibling in the triage band, and fix the gage counterpart

The machine page opened with a dual-bay banner directly above a hero band saying
'Controlled by'. Both answer 'what am I looking at', so the sibling is now a chip
in the band. The band takes a generic extraitems prop rather than learning what
dualpath is - the pairing is resolved by the machines plugin, not from the
relationships endpoint.

MeasuringToolDetail filtered for a machine counterpart, but the import creates a
controls edge PC -> tool, so a gage's counterpart is a computer. It rendered
nothing on every metrology station that has a PC.

Verified on screen. Full suite 2178 passed, frontend 280 passed.

frontend/src/components/AssetTriageBand.vue

@@ -19,6 +19,20 @@
       </span>
     </div>
 
+    <div v-for="item in extraitems" :key="item.label" class="triage-item">
+      <span class="triage-label">{{ item.label }}</span>
+      <span class="triage-values">
+        <component
+          v-for="link in item.links"
+          :key="link.text"
+          :is="link.to ? 'router-link' : 'span'"
+          :to="link.to || undefined"
+          class="triage-chip"
+          :class="{ link: Boolean(link.to) }"
+        >{{ link.text }}</component>
+      </span>
+    </div>
+
     <div v-if="accessmethods && accessmethods.length" class="triage-item">
       <span class="triage-label">Remote access</span>
       <span class="triage-values">
@@ -86,7 +100,15 @@ const props = defineProps({
   // printer through usesprinter and defaultprinter. Hardcoding 'controls'
   // left the band blank on the printer page, which is the one page where the
   // link is not obvious from the asset itself.
-  relationshiptypes: { type: Array, default: () => ['controls'] }
+  relationshiptypes: { type: Array, default: () => ['controls'] },
+  // Triage facts a page knows but core cannot derive from a relationship
+  // edge. The machine page's dual-bay sibling is the case this exists for:
+  // it is resolved by the machines plugin, not from the relationships
+  // endpoint, and it used to sit in its own banner above the hero - two
+  // strips of chrome saying two halves of the same "what am I looking at".
+  // Shape: [{ label, links: [{ text, to }] }]. A link with no `to` renders
+  // as plain text rather than a dead chip.
+  extraitems: { type: Array, default: () => [] }
 })
 
 const machines = ref([])
@@ -102,6 +124,7 @@ const hasAnything = computed(() =>
   Boolean(slots.actions) ||
   Boolean(props.liveness) ||
   machines.value.length > 0 ||
+  props.extraitems.length > 0 ||
   (props.accessmethods && props.accessmethods.length > 0) ||
   Boolean(props.locationname)
 )

plugins/machines/frontend/views/MachineDetail.vue

@@ -20,16 +20,6 @@
     <div v-if="loading" class="loading">Loading...</div>
 
     <template v-else-if="machine">
-      <!-- Dual-bay sibling banner: a Dualpath pair is one physical machine -->
-      <div v-if="machine.dualpathpartner" class="dualpath-banner">
-        Dual-bay machine - sibling bay:
-        <router-link
-          v-if="machine.dualpathpartner.machineid"
-          :to="`/machines/${machine.dualpathpartner.machineid}`"
-        >{{ machine.dualpathpartner.assetnumber }}</router-link>
-        <span v-else>{{ machine.dualpathpartner.assetnumber }}</span>
-      </div>
-
       <!-- Hero Section -->
       <div class="hero-card">
         <div class="hero-image" v-if="machine.machine?.imageurl">
@@ -80,6 +70,7 @@
             :assetid="machine.assetid"
             counterparttype="computer"
             counterpartlabel="Controlled by"
+            :extraitems="triageextras"
           />
         </div>
       </div>
@@ -259,7 +250,7 @@
 </template>
 
 <script setup>
-import { ref, onMounted } from 'vue'
+import { ref, computed, onMounted } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { machinesApi } from '@/api'
 import { withBase } from '@/utils/basePath'
@@ -281,6 +272,25 @@ const { isEnabled } = useIdentifierFlags()
 
 const loading = ref(true)
 const machine = ref(null)
+
+// The dual-bay sibling, as a triage chip. It had its own banner above the hero
+// until the band existed; two strips of chrome answering two halves of the same
+// "what am I looking at" read as clutter, and the sibling belongs beside the
+// PC that drives the machine rather than above it.
+const triageextras = computed(() => {
+  const partner = machine.value?.dualpathpartner
+  if (!partner) return []
+  return [{
+    // Says what the pair MEANS, not just that a link exists: a dualpath pair is
+    // one physical machine in two bays, which is why the old banner spelled it
+    // out rather than showing a bare number.
+    label: 'Dual-bay sibling',
+    links: [{
+      text: partner.assetnumber,
+      to: partner.machineid ? `/machines/${partner.machineid}` : null
+    }]
+  }]
+})
 const { heroWarranty, warrantyDate } = useWarrantyBadge(() => machine.value?.assetid)
 
 // relationships render via the shared AssetRelationships card
@@ -334,21 +344,6 @@ async function confirmRetire() {
   font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
 }
 
-.dualpath-banner {
-  margin-bottom: 16px;
-  padding: 10px 14px;
-  border-radius: 6px;
-  background: var(--bg-card);
-  border: 1px solid var(--border);
-  border-left: 4px solid var(--primary);
-  color: var(--text);
-  font-size: 0.9rem;
-}
-
-.dualpath-banner a {
-  color: var(--link);
-  font-weight: 600;
-}
 
 .feature-tag {
   display: inline-block;

plugins/measuringtools/frontend/views/MeasuringToolDetail.vue

@@ -47,13 +47,20 @@
             </div>
           </div>
 
-          <!-- The 6am band. A gage usually has no controls edge at all,
-               and the band renders nothing when it has nothing to say - it is
-               here so the five asset pages stay one shape rather than five. -->
+          <!-- The 6am band: which PC drives this instrument.
+               A metrology tool is reached through the PC that runs it - the
+               import synthesizes one measuring-tool asset per metrology PC and
+               a 'controls' edge PC -> tool (stage_metrology), so the
+               counterpart here is a COMPUTER, exactly as on the machine page.
+               This was first written as counterparttype="machine" labelled
+               "Used on", which filtered for a counterpart that cannot exist
+               and so rendered nothing on every gage that had a PC. A hand-held
+               gage genuinely has no such edge, and the band correctly shows
+               nothing for it. -->
           <AssetTriageBand
             :assetid="tool.assetid"
-            counterparttype="machine"
-            counterpartlabel="Used on"
+            counterparttype="computer"
+            counterpartlabel="Controlled by"
           />
         </div>
       </div>