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_none/expected.json

@@ -0,0 +1,24 @@
+{
+  "facts": [],
+  "decisions": [],
+  "todos": [],
+  "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": "Mira",
+      "position": "Mira thinks Tuesday might work better for support.",
+      "evidence": "Mira: Tuesday might work better for support."
+    },
+    {
+      "speaker": "Lea",
+      "position": "Lea suggests keeping Friday and making the dashboard shorter.",
+      "evidence": "Lea: Or we keep Friday and make the dashboard shorter."
+    }
+  ],
+  "technical": []
+}