Move CI/CD reference docs from memory to in-repo docs/

Moves ci-cd.md (59 lines) from Claude memory into docs/ alongside
existing architecture docs. Slims MEMORY.md from 42 to 18 lines by
removing sections duplicated in CLAUDE.md (Tech Stack, Key Patterns,
Architecture Docs index).

Total memory load per session: 101 → 18 lines.

Fixes #7

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

docs/ci-cd.md

@@ -0,0 +1,58 @@
+# CI/CD Details for ErsatzTV Fork
+
+## Upstream GitHub Actions (to adapt for Gitea)
+
+### Workflows
+| File | Trigger | Purpose |
+|------|---------|---------|
+| `ci.yml` | Push to main | Version calc → docker.yml + artifacts.yml |
+| `release.yml` | GitHub Release | Same but with release version tags |
+| `docker.yml` | Reusable workflow | Multi-arch Docker build+push (amd64, arm32v7, arm64) |
+| `artifacts.yml` | Reusable workflow | Platform binaries (macOS DMG, Windows exe, Linux) |
+| `pr.yml` | Pull request | Build+test on Linux, Windows, Mac |
+
+### What to keep for Gitea fork
+- **Docker build**: Simplify to amd64-only (jazz is x86_64), push to Gitea registry or local registry
+- **PR checks**: Build + test on Linux only (single runner on jazz)
+- **Drop**: macOS/Windows artifacts, code signing, multi-arch, GHCR/DockerHub push
+
+### Build Steps (from pr.yml — the test workflow)
+```bash
+dotnet restore
+sed -i '/Scanner/d' ErsatzTV/ErsatzTV.csproj   # strip Scanner project ref
+dotnet build --configuration Release --no-restore
+dotnet test --blame-hang-timeout "2m" --no-restore --verbosity normal
+```
+
+### Docker Build (from docker.yml)
+- Uses `docker/build-push-action@v5`
+- Dockerfile: `docker/Dockerfile` (amd64), `docker/arm32v7/Dockerfile`, `docker/arm64/Dockerfile`
+- Build arg: `INFO_VERSION` for version stamp
+- Base image: `ghcr.io/ersatztv/ersatztv-ffmpeg:7.1.1` (custom ffmpeg)
+- Needs Java in build stage (OpenAPI generator)
+- Multi-stage: ffmpeg base → .NET runtime → build → final
+
+### Image References to Update
+- `jasongdove/ersatztv` → fork's registry image name
+- `ghcr.io/ersatztv/ersatztv` → Gitea registry or local registry
+- `ghcr.io/ersatztv/ersatztv-ffmpeg:7.1.1` — still needed as base; could mirror locally
+
+### Gitea Actions Compatibility Notes
+- Gitea Actions is GitHub Actions compatible but some actions need replacements
+- `actions/checkout@v4` → works in Gitea Actions
+- `actions/setup-dotnet@v4` → works in Gitea Actions
+- `docker/login-action@v3` → needs Gitea registry credentials instead
+- `docker/build-push-action@v5` → works but target registry changes
+- `actions/upload-artifact@v4` / `download-artifact@v4` → works in Gitea Actions
+- Reusable workflows (`workflow_call`) → supported in Gitea Actions
+
+### Container Registry Options (from server-management#172)
+1. **Gitea built-in** (Packages feature) — images at `192.168.1.95:3000/timothy/<package>`, needs HTTPS or `--insecure-registry`
+2. **Local Docker registry** — `registry:2` on jazz at port 5000
+
+### Runner Setup (from server-management#172)
+- `gitea/act_runner:latest` container on jazz
+- Needs Docker socket for DinD builds
+- Register via Gitea Admin → Runners → token
+- Labels: `ubuntu-latest`, `docker`
+- jazz has 128GB RAM, plenty for .NET builds (2-4GB)