chore: add Claude Code project context

.claude/skills/docker-compose-stack.md

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+# Docker Compose Stack Skill
+
+Use this skill when adding, reviewing, or modifying regular Docker Compose stacks in this repository.
+
+## Workflow
+
+1. Confirm the service belongs in the non-Swarm Compose repo.
+2. Create or update `<service>-compose.yml`.
+3. Create or update `<service>.env.example` with placeholders only.
+4. Keep real secrets out of the repo.
+5. Include healthchecks when practical.
+6. Use configurable paths and document required host directories.
+7. Validate with `docker compose config` when Docker is available.
+8. Summarize changed files and any manual setup steps.
+
+## Compose Standards
+
+- Use 2-space YAML indentation.
+- Prefer explicit image tags over unpinned `latest` when stability matters.
+- Use `restart: unless-stopped` for ordinary long-running services unless there is a reason not to.
+- Put service-specific networks at the bottom of the file.
+- Avoid hardcoding passwords, domains, tokens, or private IP assumptions unless they are already public repo conventions.
+- For reverse proxy routing, add comments instead of assuming a specific proxy unless the user provides details.
+
+## Validation Command Pattern
+
+```bash
+docker compose --env-file <service>.env.example -f <service>-compose.yml config
+```