test: add unit tests for all 10 routers (92 total)

New test files:
- test_conversations.py — list/create/get/update/delete/delete-all, admin enforcement
- test_presets.py — list/create/update/delete, default preset protection
- test_profile.py — get/update/default, length validation
- test_models_router.py — list/ps/show/stats/search-status, connect errors
- test_completions.py — API key auth, FIM passthrough, streaming/blocking, errors
- test_search_route.py — explicit search flow, no results, stream errors
- test_memories.py — edit/search/stats endpoints, validation, admin enforcement

Update AGENTS.md with full test file coverage table and README.md

tests/test_models_router.py

@@ -0,0 +1,138 @@
+import os
+from pathlib import Path
+
+import httpx
+from fastapi.testclient import TestClient
+
+import app
+import db
+import routers.models
+from security import SESSIONS, PIN_ATTEMPTS, RATE_EVENTS
+
+
+def make_client(tmp_path: Path) -> TestClient:
+    os.environ["JARVISCHAT_ADMIN_PIN"] = "1234"
+    db.DB_PATH = tmp_path / "jarvischat-models.db"
+    SESSIONS.clear()
+    PIN_ATTEMPTS.clear()
+    RATE_EVENTS.clear()
+    db.init_db()
+    return TestClient(app.app, raise_server_exceptions=False)
+
+
+def _guest_headers(client: TestClient) -> dict:
+    sid = client.post("/api/auth/guest", headers={"Origin": "http://testserver"}).json()["session_id"]
+    return {"X-Session-ID": sid, "Origin": "http://testserver"}
+
+
+class _MockAsyncResponse:
+    """Mock for httpx.AsyncClient.get/post that returns a JSON response."""
+    def __init__(self, status_code=200, json_data=None):
+        self.status_code = status_code
+        self._json_data = json_data or {}
+
+    def json(self):
+        return self._json_data
+
+
+async def _mock_get_models(*args, **kwargs):
+    return _MockAsyncResponse(json_data={
+        "data": [{"id": "llama3.1:latest"}, {"id": "qwen2:latest"}]
+    })
+
+
+async def _mock_get_empty_models(*args, **kwargs):
+    return _MockAsyncResponse(json_data={"data": []})
+
+
+async def _mock_connect_error(*args, **kwargs):
+    raise httpx.ConnectError("Connection refused")
+
+
+async def _mock_show_model(*args, **kwargs):
+    return _MockAsyncResponse(json_data={
+        "modelfile": "FROM llama3.1", "parameters": {}
+    })
+
+
+async def _mock_search_available(*args, **kwargs):
+    return _MockAsyncResponse(status_code=200)
+
+
+async def _mock_search_unavailable(*args, **kwargs):
+    raise httpx.ConnectError("refused")
+
+
+def test_list_models(tmp_path: Path, monkeypatch):
+    monkeypatch.setattr(httpx.AsyncClient, "get", _mock_get_models)
+    with make_client(tmp_path) as client:
+        resp = client.get("/api/models", headers=_guest_headers(client))
+        assert resp.status_code == 200
+        models = resp.json()["models"]
+        assert len(models) == 2
+        assert models[0]["name"] == "llama3.1:latest"
+
+
+def test_list_models_connect_error(tmp_path: Path, monkeypatch):
+    monkeypatch.setattr(httpx.AsyncClient, "get", _mock_connect_error)
+    with make_client(tmp_path) as client:
+        resp = client.get("/api/models", headers=_guest_headers(client))
+        assert resp.status_code == 502
+
+
+def test_running_models(tmp_path: Path, monkeypatch):
+    monkeypatch.setattr(httpx.AsyncClient, "get", _mock_get_models)
+    with make_client(tmp_path) as client:
+        resp = client.get("/api/ps", headers=_guest_headers(client))
+        assert resp.status_code == 200
+        assert "data" in resp.json()
+
+
+def test_running_models_connect_error(tmp_path: Path, monkeypatch):
+    monkeypatch.setattr(httpx.AsyncClient, "get", _mock_connect_error)
+    with make_client(tmp_path) as client:
+        resp = client.get("/api/ps", headers=_guest_headers(client))
+        assert resp.status_code == 502
+
+
+def test_show_model(tmp_path: Path, monkeypatch):
+    monkeypatch.setattr(httpx.AsyncClient, "post", _mock_show_model)
+    with make_client(tmp_path) as client:
+        resp = client.post("/api/show", json={"model": "llama3.1:latest"}, headers=_guest_headers(client))
+        assert resp.status_code == 200
+        assert resp.json()["modelfile"] == "FROM llama3.1"
+
+
+def test_show_model_connect_error(tmp_path: Path, monkeypatch):
+    monkeypatch.setattr(httpx.AsyncClient, "post", _mock_connect_error)
+    with make_client(tmp_path) as client:
+        resp = client.post("/api/show", json={"model": "llama3.1:latest"}, headers=_guest_headers(client))
+        assert resp.status_code == 502
+
+
+def test_system_stats(tmp_path: Path, monkeypatch):
+    monkeypatch.setattr(routers.models, "get_gpu_stats", lambda: {"gpu_percent": 15, "vram_percent": 30, "available": True})
+    with make_client(tmp_path) as client:
+        resp = client.get("/api/stats", headers=_guest_headers(client))
+        assert resp.status_code == 200
+        data = resp.json()
+        assert "cpu_percent" in data
+        assert "memory_percent" in data
+        assert data["gpu_percent"] == 15
+        assert data["gpu_available"] is True
+
+
+def test_search_status_available(tmp_path: Path, monkeypatch):
+    monkeypatch.setattr(httpx.AsyncClient, "get", _mock_search_available)
+    with make_client(tmp_path) as client:
+        resp = client.get("/api/search/status", headers=_guest_headers(client))
+        assert resp.status_code == 200
+        assert resp.json()["available"] is True
+
+
+def test_search_status_unavailable(tmp_path: Path, monkeypatch):
+    monkeypatch.setattr(httpx.AsyncClient, "get", _mock_search_unavailable)
+    with make_client(tmp_path) as client:
+        resp = client.get("/api/search/status", headers=_guest_headers(client))
+        assert resp.status_code == 200
+        assert resp.json()["available"] is False