Build independent Everon successor foundation and native regressions

tests/policy_harness.py

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+"""Execute actual Enforce policy bodies as C++, without claiming engine coverage."""
+from pathlib import Path
+import subprocess,tempfile,re
+ROOT=Path(__file__).resolve().parents[1]
+def body(path,signature):
+ s=path.read_text();a=s.index(signature);b=s.index('{',a);i=b+1;depth=1
+ while depth:
+  depth+=(s[i]=='{')-(s[i]=='}');i+=1
+ return s[a:i]
+def run(code):
+ with tempfile.TemporaryDirectory(prefix='err-policy-') as tmp:
+  p=Path(tmp);(p/'check.cpp').write_text(code)
+  subprocess.run(['g++','-std=c++17','-Wall','-Werror',str(p/'check.cpp'),'-o',str(p/'check')],check=True)
+  subprocess.run([str(p/'check')],check=True)