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_vs_positions/expected.json

@@ -0,0 +1,42 @@
+{
+  "facts": [
+    {
+      "fact": "The pilot survey closed yesterday with 42 responses.",
+      "evidence": "Hannah: The pilot survey closed yesterday with 42 responses."
+    },
+    {
+      "fact": "The average pilot survey rating was 3.8 out of 5.",
+      "evidence": "Leo: The average rating was 3.8 out of 5."
+    },
+    {
+      "fact": "Northwind, Verdan, and Eastport did not respond to the survey.",
+      "evidence": "Hannah: That part is true. Northwind, Verdan, and Eastport did not respond."
+    }
+  ],
+  "decisions": [],
+  "todos": [],
+  "questions": [
+    {
+      "question": "Why does Marta think the survey result is weaker than it looks?",
+      "evidence": "Leo: Why?"
+    }
+  ],
+  "positions": [
+    {
+      "speaker": "Marta",
+      "position": "Marta thinks the pilot survey result is weaker than it looks.",
+      "evidence": "Marta: I think that is weaker than it looks."
+    },
+    {
+      "speaker": "Leo",
+      "position": "Leo feels the pilot is healthy.",
+      "evidence": "Leo: I still feel the pilot is healthy."
+    },
+    {
+      "speaker": "Marta",
+      "position": "Marta thinks the rollout should slow down.",
+      "evidence": "Marta: I disagree. My view is that we should slow down the rollout."
+    }
+  ],
+  "technical": []
+}