fix: restore Python 3.12 startup and release 2.0.1

tests/unit/core/test_diagnostics.py

@@ -15,6 +15,7 @@
 """Unit tests for Artemis System Diagnostics & Readiness Engine."""
 
 import asyncio
+from types import SimpleNamespace
 from unittest.mock import AsyncMock, Mock
 
 import pytest
@@ -173,7 +174,13 @@ async def test_dashboard_reuses_recent_confirmed_state_on_one_timeout(monkeypatc
 
 
 @pytest.mark.asyncio
-async def test_readiness_engine_coalesces_concurrent_full_scans():
+@pytest.mark.parametrize("same_clock_tick", [False, True])
+async def test_readiness_engine_coalesces_concurrent_full_scans(same_clock_tick, monkeypatch):
+    if same_clock_tick:
+        monkeypatch.setattr(
+            "artemis.core.diagnostics.engine.time",
+            SimpleNamespace(monotonic=lambda: 100.0, time=lambda: 100.0),
+        )
     engine = ReadinessEngine()
     result = ProbeResult(
         id="test_probe",
@@ -200,7 +207,13 @@ async def test_readiness_engine_coalesces_concurrent_full_scans():
 
 
 @pytest.mark.asyncio
-async def test_readiness_engine_reuses_cache_until_forced():
+@pytest.mark.parametrize("same_clock_tick", [False, True])
+async def test_readiness_engine_reuses_cache_until_forced(same_clock_tick, monkeypatch):
+    if same_clock_tick:
+        monkeypatch.setattr(
+            "artemis.core.diagnostics.engine.time",
+            SimpleNamespace(monotonic=lambda: 100.0, time=lambda: 100.0),
+        )
     engine = ReadinessEngine()
     result = ProbeResult(
         id="test_probe",