feat(release): prepare first public preview

CLAUDE.md

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+# Repository guide
+
+Magent combines a FastAPI backend, Next.js frontend and SQLite database. Read
+`CONTRIBUTING.md` before changing code and `docs/INSTALLATION.md` before changing
+deployment behavior.
+
+## Important paths
+
+- `backend/app/`: API, integrations, setup, persistence and background work.
+- `frontend/app/`: application routes and interface components.
+- `backend/tests/` and frontend `*.test.*`: synthetic regression coverage.
+- `compose.yml`: public prebuilt-image deployment.
+- `Dockerfile`: pinned multi-stage production build.
+
+## Working rules
+
+- Never read, commit or print real `.env`, database, backup or credential data.
+- Keep SQLite to one backend worker and one writable application instance.
+- Preserve origin checks, CSP nonces, non-root execution and persistent key/data paths.
+- Add regression tests and run the checks in `CONTRIBUTING.md`.
+- Use synthetic fixtures; do not call live media services from tests.