chore: add Claude Code project context

CLAUDE.md

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+# Docker Swarm Services Repository
+
+This repository is for Docker Swarm stack files for Wheelz's HomeLab.
+
+## Repository Purpose
+
+- Store stack files intended for `docker stack deploy`.
+- Do not add regular non-Swarm Docker Compose stacks here.
+- Use this repo for services that are deployed to a Docker Swarm cluster.
+
+## Rules
+
+- Never commit real secrets, passwords, tokens, API keys, private keys, or recovery codes.
+- Use `.env.example` files and Docker secrets/config references for sensitive values.
+- Prefer Swarm-compatible Compose syntax. Avoid features that only work with local `docker compose` unless documented as unsupported in Swarm.
+- Use `deploy:` settings intentionally: replicas, placement constraints, restart policies, resources, labels, and update/rollback config where useful.
+- Use overlay networks for inter-service communication.
+- Preserve existing files unless the user explicitly asks to replace or reorganize them.
+- Do not push to Gitea unless the user explicitly asks.
+
+## Validation
+
+For Swarm stack files, syntax-check with:
+
+```bash
+docker compose --env-file <service>.env.example -f <service>-compose.yml config
+```
+
+Then review for Swarm compatibility before deployment with:
+
+```bash
+docker stack deploy -c <stack-file>.yml <stack-name>
+```
+
+Do not actually deploy unless the user explicitly asks.
+
+## Current Files
+
+- `claude-compose.yml` — Docker Swarm stack for Claude Code.
+- `claude.env.example` — example environment values for Claude Code stack.