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/question_simple/README.md

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+# question_simple
+
+Tests extraction of an explicit open question.
+
+The transcript also contains a non-task: Kai says he can ask finance but explicitly does not accept it as a task yet.
+
+Typical LLM mistakes:
+
+- Creating a todo for Kai despite his correction.
+- Missing that the group decides to leave the issue open.
+- Treating "support package" as enough information to answer the question.

tests/gold/question_simple/expected.json

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+{
+  "facts": [
+    {
+      "fact": "The vendor invoice came in this morning.",
+      "evidence": "Kai: The vendor invoice came in this morning."
+    },
+    {
+      "fact": "The invoice line item says support package.",
+      "evidence": "Kai: I don't know. The line item just says support package."
+    }
+  ],
+  "decisions": [
+    {
+      "decision": "The support-hours invoice issue will remain an open question for now.",
+      "evidence": "Ruth: Fine. Let's leave it as an open question for now."
+    }
+  ],
+  "todos": [],
+  "questions": [
+    {
+      "question": "Does the vendor invoice include the extra support hours from March?",
+      "evidence": "Ruth: Does it include the extra support hours from March?"
+    }
+  ],
+  "positions": [],
+  "technical": []
+}

tests/gold/question_simple/transcript.txt

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+Kai: The vendor invoice came in this morning.
+
+Ruth: Does it include the extra support hours from March?
+
+Kai: I don't know. The line item just says support package.
+
+Ruth: Then that is still open.
+
+Kai: I can ask finance, but I am not taking that as a task yet.
+
+Ruth: Fine. Let's leave it as an open question for now.
+
+Kai: Understood.
+
+Ruth: Anything else on invoices?
+
+Kai: No.
+
+Ruth: Then next item.