chore(core): stage 1 contracts — dialog, API schemas + fixtures, integrations, monitoring, modules

Freeze interfaces between lanes A (bot), B (backend), C (dashboard) so three developers work in
parallel without touching each other's files: dialog Event/Reply + engine registry with echo stub,
integration protocols with in-memory defaults, MonitoringService with noop stub, /api/v1 schemas
with fixture-backed routes, frozen main.py wiring, config/modules.yaml + due_scales(), DAR-5,
tzdata, Andrey trajectory, lanes in WORKFLOW, ADR-010.

Refs #34

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_contracts.py

@@ -0,0 +1,21 @@
+from fastapi.testclient import TestClient
+
+from app.dialog.contracts import Event, get_engine
+from app.main import app
+from app.services.contracts import get_monitoring
+
+
+async def test_stubs_are_usable() -> None:
+    replies = await get_engine().handle("tok", Event(type="text", text="привет"))
+    assert replies and replies[0].text
+    assert await get_monitoring().after_data_change("tok") == []
+
+
+def test_api_fixture_routes() -> None:
+    with TestClient(app) as c:
+        patients = c.get("/api/v1/doctors/doc-smirnova/patients").json()
+        assert patients[0]["status_color"] == "red"
+        card = c.get("/api/v1/patients/tok-andrey", params={"doctor_id": "doc-smirnova"}).json()
+        assert card["safety_plan"] and card["series"]
+        assert c.post("/api/v1/dialog/tok-andrey/events", json={"type": "text", "text": "ok"}).status_code == 200
+        assert c.get("/api/v1/demo/clock").json()["virtual"] is True