## Architecture

**Target shape:** standalone business application (DR-2 B).

| Layer | Direction |
|-------|-----------|
| Product UI | Code-owned UI replacing bubble.io pages (stack TBD after feature cut) |
| Domain model | Relational, tenant-keyed from migration one |
| Identity | App-local member accounts (DR-3 A); single auth module for later OIDC |
| Delivery | commit-SHA images → `gitea.coulomb.social/coulomb/coulomb-social` → `railiance-apps` → railiance01 |
| Contract | business-app service contract v0.1 §§1–6 |

Reference implementation for the delivery lane: `vergabe-teilnahme`.

Current maturity: orientation and assessment only — no application runtime yet.

## Quick Reference

`~/state-hub/mcp_server/TOOLS.md` — MCP tool reference