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/decision_deferred/expected.json

@@ -0,0 +1,31 @@
+{
+  "facts": [],
+  "decisions": [
+    {
+      "decision": "The substantive decision is deferred until more information is available.",
+      "evidence": "Mira: Okay, let's not decide this today. Jonas: Agreed, we need more input."
+    }
+  ],
+  "todos": [
+    {
+      "task": "Lea will bring Dana's feedback about the weekly dashboard next time.",
+      "responsible": "Lea",
+      "deadline": "next time",
+      "evidence": "Lea: I will bring Dana's feedback next time."
+    }
+  ],
+  "questions": [],
+  "positions": [
+    {
+      "speaker": "Jonas",
+      "position": "Jonas prefers moving the weekly dashboard to Monday morning.",
+      "evidence": "Jonas: I would prefer moving it to Monday morning."
+    },
+    {
+      "speaker": "Lea",
+      "position": "Lea thinks Monday is difficult for support.",
+      "evidence": "Lea: Monday is rough for support."
+    }
+  ],
+  "technical": []
+}