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).

docs/OPERATIONS.md

@@ -1,14 +1,54 @@
 # Operations (day-2)
 
-**Status:** Outline.
+**Status:** Doctor (S6) implemented.
 
-## Operator commands (when implemented)
+## Health checks (doctor)
 
 ```bash
+# Run all health checks (human-readable)
+make doctor
+# or
 ./scripts/doctor.sh
+
+# Machine-readable JSON summary
+./scripts/doctor.sh --json
+```
+
+**What doctor checks:**
+
+| Check | What it validates | Severity |
+|-------|-------------------|----------|
+| Docker | Daemon running and accessible | Critical |
+| nemohermes CLI | Installed and versioned | Critical |
+| openshell CLI | Installed and versioned | Critical |
+| Sandbox | `nemohermes <name> doctor` healthy | Critical |
+| Policy | `lumina-inference` preset applied | Warning |
+| Skills | Skill directories with SKILL.md present | Warning |
+| Inference endpoint | `/v1/models` reachable from .env URL | Critical |
+| Inference gateway | `openshell inference get` configured | Warning |
+
+**Exit codes:** `0` = all critical checks passed; `1` = one or more critical failures.
+
+## Platform diagnostics
+
+```bash
+# Sandbox status
 nemohermes <sandbox-name> status
+
+# Sandbox doctor (platform-level)
+nemohermes <sandbox-name> doctor
+
+# Sandbox logs
 nemohermes <sandbox-name> logs --follow
-docker compose -f deploy/compose/docker-compose.yml logs
+
+# Gateway status
+openshell status
+
+# Inference config
+openshell inference get
+
+# Policy presets
+nemohermes <sandbox-name> policy-list
 ```
 
 ## Log levels