docs: add HANDOFF_20260531 + fix region us-central1 → europe-west1 in MASTERPLAN

docs/HANDOFF_20260531.md

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+# HANDOFF — 2026-05-31
+
+**Dato:** 2026-05-31 ~12:42 CEST  
+**Operatør:** Chris Christiansen  
+**Status:** Sesjon avsluttet. Klar for neste sesjon.
+
+---
+
+## Hva ble gjort denne sesjonen
+
+- [x] `.gemini/GEMINI.md` oppgradert: Gemini 2.5 Pro → **Claude Opus 4.6 via Vertex AI EU endpoint**
+- [x] Region fikset overalt: `us-central1` → `europe-west1` / `eu`
+- [x] `GCP_VERTEX_LOC: eu` lagt til som locked definition
+- [x] Claude Vertex EU diagnostics playbook lagt inn i GEMINI.md
+- [x] `MASTERPLAN.md` region fikset: `us-central1` → `europe-west1`
+- [x] Denne HANDOFF-filen opprettet
+
+---
+
+## NESTE OPPGAVE
+
+**Phase 8 — End-to-end test av agent via opax.vauco.no**
+
+Før du begynner:
+1. Aktiver Claude Opus 4.6 i Vertex AI Model Garden (hvis ikke gjort):
+   ```
+   GCP Console → Vertex AI → Model Garden → søk "Claude Opus 4" → Enable
+   ```
+2. Verifiser at Cloud Run `osvauco-agent` kjører i `europe-west1` (ikke `us-central1`)
+3. Test agent-endepunkt via IAP:
+   ```bash
+   curl -s -o /dev/null -w "%{http_code}" \
+     -H "Authorization: Bearer $(gcloud auth print-identity-token)" \
+     https://opax.vauco.no/health
+   ```
+4. Test Claude Opus 4.6 EU endpoint direkte:
+   ```bash
+   curl -X POST \
+     "https://eu-aiplatform.googleapis.com/v1/projects/propane-will-491900-m5/locations/eu/publishers/anthropic/models/claude-opus-4-6@20260301:rawPredict" \
+     -H "Authorization: Bearer $(gcloud auth print-access-token)" \
+     -H "Content-Type: application/json" \
+     -d '{"anthropic_version": "vertex-2023-10-16", "max_tokens": 64, "messages": [{"role": "user", "content": "ping"}]}'
+   ```
+5. Full end-to-end: logg inn på `opax.vauco.no`, send en melding, verifiser at agenten svarer via Claude Opus 4.6
+
+---
+
+## Gjeldende infrastrukturstatus
+
+| Komponent | Status |
+|-----------|--------|
+| Cloud Run `osvauco-agent` | ✅ Live (europe-west1) |
+| `opax.vauco.no` LB + SSL | ✅ Live |
+| IAP | ✅ Aktivert (`@vauco.no`) |
+| CI/CD Cloud Build | ✅ Operativt (Fase 6 ferdig) |
+| RAG corpus `osvauco-corpus` | ✅ Populert (europe-west4) |
+| Claude Opus 4.6 Vertex EU | ⏳ Krever Model Garden aktivering |
+| BigQuery billing export | ⏳ Venter på første data |
+
+---
+
+## Boot-prompt til neste sesjon
+
+```
+BOOT: Read docs/AGENT_RULEBOOK.md, docs/VAUCO_OS_ROADMAP.md, docs/OSVAUCO_OPAX_SESSION_LOG.md.
+Print LOCKED DEFINITIONS. Print last NESTE OPPGAVE. Do not take any action until I give a PLAN prompt.
+```