Establish prompt engineering baseline with Gold Standard tests

- introduce Gold Standard evaluation corpus
- document decision taxonomy
- define prompt-engineering methodology
- add regression workflow
- establish Prompt Version 2 baseline
- validate decision_simple, decision_deferred and decision_none

tests/gold/facts_simple/expected.json

@@ -0,0 +1,32 @@
+{
+  "facts": [
+    {
+      "fact": "The old scanner gateway is still running in aisle three.",
+      "evidence": "Tom: The old scanner gateway is still running in aisle three."
+    },
+    {
+      "fact": "Aisles one and two moved to the new gateway last week.",
+      "evidence": "Tom: Yes. Aisles one and two moved to the new gateway last week."
+    },
+    {
+      "fact": "The new gateway is handling live scans for receiving.",
+      "evidence": "Iris: The new gateway is already handling live scans for receiving."
+    }
+  ],
+  "decisions": [],
+  "todos": [],
+  "questions": [
+    {
+      "question": "Is aisle three the only scanner gateway still left on the old gateway?",
+      "evidence": "Elena: Is that the only one left?"
+    }
+  ],
+  "positions": [],
+  "technical": [
+    {
+      "subject": "Scanner gateway rollout",
+      "statement": "Aisle three remains on the old scanner gateway while aisles one and two use the new gateway.",
+      "evidence": "The old scanner gateway is still running in aisle three. Aisles one and two moved to the new gateway last week."
+    }
+  ]
+}