add spec system: sdd/bdd/tdd loops, trace enforcement, envelope+config specs

tests/conftest.py

@@ -0,0 +1,15 @@
+import re
+from pathlib import Path
+
+FEATURES_DIR = Path(__file__).resolve().parent.parent / "features"
+TAG_RE = re.compile(r"@([A-Z]{2,8}-\d{2,3})\b")
+
+
+def pytest_configure(config):
+    # pytest-bdd turns @ENV-01 tags into markers; register them so
+    # --strict-markers stays enabled (D-005).
+    ids = set()
+    for feature in FEATURES_DIR.glob("**/*.feature"):
+        ids |= set(TAG_RE.findall(feature.read_text(encoding="utf-8")))
+    for req_id in sorted(ids):
+        config.addinivalue_line("markers", f"{req_id}: spec requirement tag")