Phase 1 data layer: calc/fmt/alarms + 31 CPython tests + live gateway P1 smoke

pytest 31/31. In-gateway end-to-end: 559 activations correlated (uuid mode), 3 chatterers,
34 fleeting, 1 flood, health F(22) on the deliberately-bad sim plant. Gate G1 green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/conftest.py

@@ -0,0 +1,21 @@
+"""Register PrimeControls.{calc,fmt} from the Ignition project's code.py files so
+pytest imports them exactly as the gateway does (single source of truth)."""
+import importlib.util
+import os
+import sys
+import types
+
+ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+SP = os.path.join(ROOT, "ignition", "gateway", "projects", "PrimeBAT",
+                  "ignition", "script-python", "PrimeControls")
+
+pkg = types.ModuleType("PrimeControls")
+pkg.__path__ = [SP]
+sys.modules["PrimeControls"] = pkg
+for mod in ("calc", "fmt"):
+    spec = importlib.util.spec_from_file_location(
+        "PrimeControls." + mod, os.path.join(SP, mod, "code.py"))
+    m = importlib.util.module_from_spec(spec)
+    sys.modules["PrimeControls." + mod] = m
+    spec.loader.exec_module(m)
+    setattr(pkg, mod, m)