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/README.md

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+# decision_deferred
+
+Tests that a process decision to defer a substantive decision is still extracted
+as a decision.
+
+The transcript contains several candidate options for the weekly dashboard, but
+the group does not choose any of them. Instead, Mira explicitly says not to
+decide today and Jonas agrees that more input is needed.
+
+Ground truth:
+
+- No substantive dashboard schedule decision is reached.
+- One process decision is reached: the substantive decision is deferred until
+  more information is available.
+
+Typical LLM mistakes:
+
+- Extracting Monday, Tuesday, or Friday as the chosen dashboard day.
+- Treating "I like shorter" as an approval.
+- Missing the deferral because the substantive decision is unresolved.
+- Treating "no decision today" as equivalent to no decision at all.

tests/gold/decision_deferred/expected.json

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+{
+  "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": []
+}

tests/gold/decision_deferred/transcript.txt

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+Mira: We need to talk about the weekly dashboard.
+
+Jonas: I would prefer moving it to Monday morning.
+
+Lea: Monday is rough for support. We usually have backlog cleanup then.
+
+Mira: Tuesday might work, but I am not sure.
+
+Jonas: Or we keep it on Friday and just make it shorter.
+
+Lea: I like shorter, but I need to check with Dana first.
+
+Mira: Okay, let's not decide this today.
+
+Jonas: Agreed, we need more input.
+
+Lea: I will bring Dana's feedback next time.
+
+Mira: Thanks, that will help.