fix: docs: nomad-cutover-runbook.md — end-to-end cutover procedure (#1060)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/nomad-cutover-runbook.md

@@ -0,0 +1,183 @@
+# Nomad Cutover Runbook
+
+End-to-end procedure to cut over the disinto factory from docker-compose on
+disinto-dev-box to Nomad on disinto-nomad-box.
+
+**Target**: disinto-nomad-box (10.10.10.216) becomes production; disinto-dev-box
+stays warm for rollback.
+
+**Downtime budget**: <5 min blue-green flip.
+
+**Data scope**: Forgejo issues + disinto-ops git bundle only. Everything else is
+regenerated or discarded. OAuth secrets are regenerated on fresh init (all
+sessions invalidated).
+
+---
+
+## 1. Pre-cutover readiness checklist
+
+- [ ] Nomad + Vault stack healthy on a fresh wipe+init (step 5 verified)
+- [ ] Codeberg mirror current — `git log` parity between dev-box Forgejo and
+      Codeberg
+- [ ] SSH key pair generated for nomad-box, registered on DO edge (see §4.6)
+- [ ] Companion tools landed:
+  - `disinto backup create` (#1057)
+  - `disinto backup import` (#1058)
+- [ ] Backup tarball produced and tested against a scratch LXC (see §3)
+
+---
+
+## 2. Pre-cutover artifact: backup
+
+On disinto-dev-box:
+
+```bash
+./bin/disinto backup create /tmp/disinto-backup-$(date +%Y%m%d).tar.gz
+```
+
+Copy the tarball to nomad-box (and optionally to a local workstation for
+safekeeping):
+
+```bash
+scp /tmp/disinto-backup-*.tar.gz nomad-box:/tmp/
+```
+
+---
+
+## 3. Pre-cutover dry-run
+
+On a throwaway LXC:
+
+```bash
+lxc launch ubuntu:24.04 cutover-dryrun
+# inside the container:
+disinto init --backend=nomad --import-env .env --with edge
+./bin/disinto backup import /tmp/disinto-backup-*.tar.gz
+```
+
+Verify:
+
+- Issue count matches source Forgejo
+- disinto-ops repo refs match source bundle
+
+Destroy the LXC once satisfied:
+
+```bash
+lxc delete cutover-dryrun --force
+```
+
+---
+
+## 4. Cutover T-0 (operator executes; <5 min target)
+
+### 4.1 Stop dev-box services
+
+```bash
+# On disinto-dev-box — stop, do NOT remove volumes (rollback needs them)
+docker-compose stop
+```
+
+### 4.2 Provision nomad-box (if not already done)
+
+```bash
+# On disinto-nomad-box
+disinto init --backend=nomad --import-env .env --with edge
+```
+
+### 4.3 Import backup
+
+```bash
+# On disinto-nomad-box
+./bin/disinto backup import /tmp/disinto-backup-*.tar.gz
+```
+
+### 4.4 Configure Codeberg pull mirror
+
+Manual, one-time step in the new Forgejo UI:
+
+1. Create a mirror repository pointing at the Codeberg upstream
+2. Confirm initial sync completes
+
+### 4.5 Claude login
+
+```bash
+# On disinto-nomad-box
+claude login
+```
+
+Set up Anthropic OAuth so agents can authenticate.
+
+### 4.6 Autossh tunnel swap
+
+> **Operator step** — cross-host, no dev-agent involvement. Do NOT automate.
+
+1. Stop the tunnel on dev-box:
+   ```bash
+   # On disinto-dev-box
+   systemctl stop reverse-tunnel
+   ```
+
+2. Copy or regenerate the tunnel unit on nomad-box:
+   ```bash
+   # Copy from dev-box, or let init regenerate it
+   scp dev-box:/etc/systemd/system/reverse-tunnel.service \
+       nomad-box:/etc/systemd/system/
+   ```
+
+3. Register nomad-box's public key on DO edge:
+   ```bash
+   # On DO edge box — same restricted-command as the dev-box key
+   echo "<nomad-box-pubkey>" >> /home/johba/.ssh/authorized_keys
+   ```
+
+4. Start the tunnel on nomad-box:
+   ```bash
+   # On disinto-nomad-box
+   systemctl enable --now reverse-tunnel
+   ```
+
+5. Verify end-to-end:
+   ```bash
+   curl https://self.disinto.ai/api/v1/version
+   # Should return the new box's Forgejo version
+   ```
+
+---
+
+## 5. Post-cutover smoke
+
+- [ ] `curl https://self.disinto.ai` → Forgejo welcome page
+- [ ] Create a test PR → Woodpecker pipeline runs → agents assign and work
+- [ ] Claude chat login via Forgejo OAuth succeeds
+
+---
+
+## 6. Rollback (if any step 4 gate fails)
+
+1. Stop the tunnel on nomad-box:
+   ```bash
+   systemctl stop reverse-tunnel   # on nomad-box
+   ```
+
+2. Restore the tunnel on dev-box:
+   ```bash
+   systemctl start reverse-tunnel  # on dev-box
+   ```
+
+3. Bring dev-box services back up:
+   ```bash
+   docker-compose up -d            # on dev-box
+   ```
+
+4. DO Caddy config is unchanged — traffic restores in <5 min.
+
+5. File a post-mortem issue. Keep nomad-box state intact for debugging.
+
+---
+
+## 7. Post-stable cleanup (T+1 week)
+
+- `docker-compose down -v` on dev-box
+- Archive `/var/lib/docker/volumes/disinto_*` to cold storage
+- Delete disinto-dev-box LXC or keep as permanent rollback reserve (operator
+  decision)