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_modules.py

@@ -0,0 +1,33 @@
+from datetime import date, timedelta
+
+from app.core.modules import due_scales, load_modules
+from app.core.scales import load_all
+
+TODAY = date(2026, 10, 3)
+
+
+def test_modules_reference_existing_scales() -> None:
+    cfg, scales = load_modules(), load_all()
+    for mod in cfg.modules.values():
+        for s in mod.start_scales + [e.scale for e in mod.schedule]:
+            assert s in scales, s
+
+
+def test_veteran_schedule() -> None:
+    last = {s: TODAY - timedelta(days=1) for s in ["pcl5", "phq9", "dar5", "auditc"]}
+    assert due_scales({"veteran"}, 10, last, TODAY) == []
+    last["pcl5"] = TODAY - timedelta(days=14)
+    assert due_scales({"veteran"}, 20, last, TODAY) == ["pcl5"]
+
+
+def test_depression_weekly_then_biweekly() -> None:
+    last = {"phq9": TODAY - timedelta(days=7), "cssrs_screen": TODAY}
+    assert due_scales({"depression"}, 20, last, TODAY) == ["phq9"]
+    assert due_scales({"depression"}, 50, last, TODAY) == []
+
+
+def test_dar5_scoring() -> None:
+    from app.core.scales import score
+
+    r = score("dar5", {f"dar5_{i}": 3 for i in range(1, 6)})
+    assert r.total == 15 and "dar5_significant" in r.flags