Implement S6 doctor and A1 daily-board with fixtures.

Add operator health checks (make doctor) wrapping platform CLIs, and the fixtures-only daily board skill library with unit tests (make verify).

skills/_lib/lumina_skills/README.md

@@ -1,9 +1,31 @@
-# Shared skill library (scaffold)
+# Shared skill library
 
-**Status:** Empty until **build**.
+**Status:** Partially implemented.
 
-Planned packages under `providers/`:
+Shared deterministic library used by Salon_Assistant skills. All code here is
+**deterministic** — no model inference, no network calls. See
+[design/det-vs-inf.md](../../../design/det-vs-inf.md).
 
-- `scheduling/` — Vagaro / Square adapters  
-- `books/` — QuickBooks Online adapters  
-- `mcp/` — MCP client helpers / allowlist metadata  
+## Packages
+
+| Package | Status | Purpose |
+|---------|--------|---------|
+| `domain.py` | ✅ | Domain types: `Appointment`, `Gap`, `DayBoard`, `AppointmentStatus` |
+| `board_builder.py` | ✅ | Deterministic board builder: gaps, confirmation flags, formatting |
+| `providers/scheduling/fixture_provider.py` | ✅ | Fixture JSON loader for scheduling data |
+| `providers/scheduling/` | ⏳ | Vagaro / Square adapters (future) |
+| `providers/books/` | ⏳ | QuickBooks Online adapters (future) |
+| `providers/mcp/` | ⏳ | MCP client helpers / allowlist metadata (future) |
+
+## Usage
+
+```python
+from lumina_skills.domain import Appointment, AppointmentStatus
+from lumina_skills.board_builder import build_board, format_board_text
+from lumina_skills.providers.scheduling.fixture_provider import load_fixtures
+```
+
+## Design references
+
+- Deterministic boundary: [design/det-vs-inf.md](../../../design/det-vs-inf.md)
+- Use cases: [design/use-cases.md](../../../design/use-cases.md)