Say why an engine's memory can exceed its node's RAM in use

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/web/templates/node.html

@@ -54,7 +54,7 @@
 </div>
 <div class="chart-row">
   {{template "tschart" dict "t" .EngineCPU "title" "Cores busy, by model" "note" "Each engine's process group, the way top counts it."}}
-  {{template "tschart" dict "t" .EngineMemory "title" "Engine memory, by model" "note" "Resident memory: the weights and the KV cache, mostly."}}
+  {{template "tschart" dict "t" .EngineMemory "title" "Engine memory, by model" "note" "Resident memory, including the weights mapped from disk. The kernel can take those pages back, so this can exceed RAM in use."}}
 </div>
 <div class="chart-row">
   {{template "tschart" dict "t" .Load "title" "Load average" "note" "Above the core count means work is waiting for a CPU."}}