feat: add Loop QA self-testing framework

Structured self-test framework that probes 6 capabilities (tool use,
multistep planning, memory read/write, self-coding, lightning econ) in
round-robin. Reuses existing infra: event_log for persistence,
create_task() for upgrade proposals, capture_error() for crash handling,
and in-memory circuit breaker for failure tracking.

- src/timmy/loop_qa.py: Capability enum, 6 async probes, orchestrator
- src/dashboard/routes/loop_qa.py: JSON + HTMX health endpoints
- HTMX partial polls every 30s on the health panel
- Background scheduler in app.py lifespan
- 25 tests covering probes, orchestrator, health snapshot, routes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/dashboard/routes/loop_qa.py

@@ -0,0 +1,34 @@
+"""Loop QA health endpoints — capability self-test status."""
+
+import logging
+
+from fastapi import APIRouter, Request
+from fastapi.responses import HTMLResponse, JSONResponse
+
+from dashboard.templating import templates
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(tags=["health"])
+
+
+@router.get("/health/loop-qa")
+async def loop_qa_health():
+    """Return HealthSnapshot as JSON."""
+    from timmy.loop_qa import loop_qa_orchestrator
+
+    snapshot = loop_qa_orchestrator.get_health_snapshot()
+    return JSONResponse(content=snapshot)
+
+
+@router.get("/health/loop-qa/partial", response_class=HTMLResponse)
+async def loop_qa_health_partial(request: Request):
+    """Return HTMX partial for the dashboard health panel."""
+    from timmy.loop_qa import loop_qa_orchestrator
+
+    snapshot = loop_qa_orchestrator.get_health_snapshot()
+    return templates.TemplateResponse(
+        request,
+        "partials/loop_qa_health.html",
+        {"snapshot": snapshot},
+    )