Seed approved structure: design SSOT, operator docs, scaffolds.

Product layout for Lumina / Salon_Assistant at 0.1.0-design.
No product implementation until explicit build.

tests/README.md

@@ -0,0 +1,12 @@
+# Tests (scaffold)
+
+**Status:** Structure only — no product tests until **build**.
+
+| Path | Purpose |
+|------|---------|
+| `unit/` | Deterministic domain/skill logic (no live model required) |
+| `contract/` | Provider/MCP allow-deny contracts |
+| `integration/` | Optional cheap-model dialogue paths |
+| `fixtures/` | Test-only fixtures |
+
+Design boundary: [design/det-vs-inf.md](../design/det-vs-inf.md).