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/README.md

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+# decision_none
+
+Tests a true decision-negative meeting segment.
+
+The transcript contains discussion, competing preferences, and possible options
+for the weekly dashboard. No participant approves an option, rejects an option
+on behalf of the group, assigns a follow-up, agrees to gather more information,
+or explicitly decides to defer the decision.
+
+Ground truth:
+
+- No decision was reached.
+- No process decision was reached.
+- No agreed next step was created.
+
+Typical LLM mistakes:
+
+- Treating a preference as a decision.
+- Treating a proposed option as the selected option.
+- Treating the topic change as an implicit deferral decision.
+- Creating an action item for Dana even though she is only mentioned as absent.

tests/gold/decision_none/expected.json

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+{
+  "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": []
+}

tests/gold/decision_none/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 because backlog cleanup starts then.
+
+Mira: Tuesday might work better for support.
+
+Jonas: Tuesday is hard for sales, at least this month.
+
+Lea: Or we keep Friday and make the dashboard shorter.
+
+Mira: I am not convinced shorter solves the timing issue.
+
+Jonas: I am not convinced Monday is actually a problem for everyone.
+
+Lea: Dana might have a view, but she is not here.
+
+Mira: We are circling now.
+
+Jonas: Yes, I do not have anything else to add.
+
+Lea: Same here.
+
+Mira: Okay, let's move to the budget topic.