chore: ai image b0ff118 (external responder), harness ed3d41d (26 min diagnose for external-*)

external-* 모델 참고 측정용. ai-agent 는 EXTERNAL_ADDR=:8090 리스너를 켜되 호스트의
127.0.0.1:8090 에만 매핑해 IAP SSH 터널로만 닿게 한다(응답이 곧 진단이므로 VPC 노출 금지).
ai.env 에 진단·턴 대기 시간(1500/1200초)을 명시. 하네스는 external- 모델의 /diagnose 를
26분 기다린다. VM 반영(make ai-sync / harness-sync)은 진행 중인 m1·Fable 배치가 끝난 뒤.

vm/ai-env/ai.env

@@ -19,6 +19,11 @@ ANTHROPIC_FEDERATION_RULE_ID=fdrl_01NYa2DRXZMrWhqDC5uNP3Yy
 ANTHROPIC_ORGANIZATION_ID=fc82f31f-51c4-4416-95f5-62584092e1bc
 ANTHROPIC_SERVICE_ACCOUNT_ID=svac_01RMQAkUx4vD6X5scTxwmebU
 ANTHROPIC_WORKSPACE_ID=wrkspc_0149qfHWmbEEBmEh4aL2vHjw
+# external-* model ids (apps b0ff118, reference runs 2026-10-16): each loop turn is answered by a client outside the VM
+# over the 127.0.0.1:8090 listener (compose EXTERNAL_ADDR). Deadlines: one diagnosis / one turn, seconds. The harness
+# waits 26 minutes per /diagnose for these ids. Results are reference records, not rows of the model comparison.
+EXTERNAL_DIAGNOSE_TIMEOUT_S=1500
+EXTERNAL_TURN_TIMEOUT_S=1200
 HARNESS_URL=http://10.20.0.11:8080
 MIMIR_URL=http://10.20.0.10:9009/prometheus
 LOKI_URL=http://10.20.0.10:3100