chore(harness): isolate pi stage execution

scripts/verify.sh

@@ -35,6 +35,7 @@ required=(
   "scripts/agent_status.py"
   "scripts/new_ticket.py"
   "scripts/pi_orquestra.sh"
+  "scripts/run_stage.py"
   "platforms/pi/README.md"
   "platforms/pi/extensions/orquestra-status/index.ts"
   "platforms/pi/extensions/orquestra-web-fetch.ts"
@@ -79,6 +80,14 @@ else
   EXIT_CODE=1
 fi
 
+ENGRAM_EXT="$HOME/.pi/agent/npm/node_modules/gentle-engram/index.ts"
+if [ -f "$ENGRAM_EXT" ]; then
+  ok "Engram instalado: $ENGRAM_EXT"
+else
+  fail "Engram es obligatorio para la memoria Orquestra: falta $ENGRAM_EXT"
+  EXIT_CODE=1
+fi
+
 if [ -d ".pi/subagents" ] || [ -f ".pi/subagents.json" ]; then
   fail "Orquestra es secuencial: no debe instalar .pi/subagents ni .pi/subagents.json"
   EXIT_CODE=1