docs: add automated compose documentation generation pipeline

docs/README.md

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+# Generated Documentation
+
+## Local generation
+
+```bash
+chmod +x scripts/docs/*.sh
+scripts/docs/generate-all.sh
+```
+
+This pipeline only runs `docker compose config` and static parsing. It does **not** start containers.
+
+## CI behaviour
+
+GitHub Actions workflow `.github/workflows/generate-docs.yml` runs on pushes/PRs to `main` and manual dispatch. It generates docs and uploads them as the `generated-documentation` artifact.
+
+## Outputs
+
+- `docs/generated`: resolved compose config and markdown inventories
+- `docs/diagrams`: DOT and SVG architecture diagram
+- `docs/public`: sanitized copy for public sharing
+
+## Publication safety
+
+- `docs/public` is intended for public sharing after sanitization.
+- `docs/generated` and `docs/diagrams` may include internal details and should be treated as internal by default.