chore: remove internal release runbook from public repo

RELEASE_RUNBOOK.md

@@ -1,80 +0,0 @@
-# Release Runbook
-
-## Release process
-
-1. Update version in `nora-registry/Cargo.toml`
-2. Update `CHANGELOG.md`
-3. Commit: `chore: bump version to X.Y.Z`
-4. Tag: `git tag vX.Y.Z && git push origin vX.Y.Z`
-5. CI builds binary + 3 Docker images (alpine, redos, astra)
-6. CI runs trivy scan on all images
-7. CI creates GitHub Release with binary, checksums, SBOM
-
-## Deploy order
-
-1. **ai-server** (internal) — update first, verify
-2. **PROD** — update after ai-server is stable
-3. **GHCR** — public images pushed by CI automatically
-
-## Rollback
-
-### Quick rollback (revert to previous version)
-
-```bash
-# On ai-server
-docker pull ghcr.io/getnora-io/nora:PREVIOUS_VERSION
-docker stop nora && docker rm nora
-docker run -d --name nora -p 4000:4000 \
-  -v /srv/nora-data:/data \
-  ghcr.io/getnora-io/nora:PREVIOUS_VERSION
-```
-
-### Delete a broken release
-
-```bash
-# 1. Delete GitHub Release (keeps tag)
-gh release delete vX.Y.Z --yes
-
-# 2. Delete tag
-git tag -d vX.Y.Z
-git push origin :refs/tags/vX.Y.Z
-
-# 3. Delete GHCR images (all variants)
-for suffix in "" "-redos" "-astra"; do
-  gh api -X DELETE /user/packages/container/nora/versions \
-    --jq ".[] | select(.metadata.container.tags[] | contains(\"X.Y.Z${suffix}\")) | .id" \
-    | xargs -I{} gh api -X DELETE /user/packages/container/nora/versions/{}
-done
-```
-
-### Binary rollback
-
-```bash
-curl -LO https://github.com/getnora-io/nora/releases/download/vPREVIOUS/nora-linux-amd64
-chmod +x nora-linux-amd64
-sudo mv nora-linux-amd64 /usr/local/bin/nora
-sudo systemctl restart nora
-```
-
-## Verification after deploy
-
-```bash
-# Health check
-curl -sf http://localhost:4000/health | jq .
-
-# Docker API
-curl -sf http://localhost:4000/v2/ | jq .
-
-# Push test image
-docker pull alpine:3.20
-docker tag alpine:3.20 localhost:4000/test/alpine:smoke
-docker push localhost:4000/test/alpine:smoke
-docker pull localhost:4000/test/alpine:smoke
-```
-
-## Known issues
-
-- Self-hosted runner uses localhost:5000 (NORA) for buildx cache.
-  If NORA is down during release, build continues without cache (ignore-error=true).
-- Trivy image scan runs after push to localhost:5000 but before GitHub Release.
-  A failed scan blocks the release.