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/facts_vs_positions/README.md

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+# facts_vs_positions
+
+Tests separation of objective facts from personal opinions.
+
+The transcript deliberately mixes numeric facts, named non-respondents, and subjective positions about rollout health.
+
+Typical LLM mistakes:
+
+- Treating Marta's opinion as an objective fact.
+- Treating Leo's optimism as a fact.
+- Extracting a rollout decision even though the group explicitly does not decide.

tests/gold/facts_vs_positions/expected.json

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+{
+  "facts": [
+    {
+      "fact": "The pilot survey closed yesterday with 42 responses.",
+      "evidence": "Hannah: The pilot survey closed yesterday with 42 responses."
+    },
+    {
+      "fact": "The average pilot survey rating was 3.8 out of 5.",
+      "evidence": "Leo: The average rating was 3.8 out of 5."
+    },
+    {
+      "fact": "Northwind, Verdan, and Eastport did not respond to the survey.",
+      "evidence": "Hannah: That part is true. Northwind, Verdan, and Eastport did not respond."
+    }
+  ],
+  "decisions": [],
+  "todos": [],
+  "questions": [
+    {
+      "question": "Why does Marta think the survey result is weaker than it looks?",
+      "evidence": "Leo: Why?"
+    }
+  ],
+  "positions": [
+    {
+      "speaker": "Marta",
+      "position": "Marta thinks the pilot survey result is weaker than it looks.",
+      "evidence": "Marta: I think that is weaker than it looks."
+    },
+    {
+      "speaker": "Leo",
+      "position": "Leo feels the pilot is healthy.",
+      "evidence": "Leo: I still feel the pilot is healthy."
+    },
+    {
+      "speaker": "Marta",
+      "position": "Marta thinks the rollout should slow down.",
+      "evidence": "Marta: I disagree. My view is that we should slow down the rollout."
+    }
+  ],
+  "technical": []
+}

tests/gold/facts_vs_positions/transcript.txt

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+Hannah: The pilot survey closed yesterday with 42 responses.
+
+Leo: The average rating was 3.8 out of 5.
+
+Marta: I think that is weaker than it looks.
+
+Leo: Why?
+
+Marta: Because three enterprise customers skipped the survey entirely.
+
+Hannah: That part is true. Northwind, Verdan, and Eastport did not respond.
+
+Leo: I still feel the pilot is healthy.
+
+Marta: I disagree. My view is that we should slow down the rollout.
+
+Hannah: Let's capture both views and not decide rollout speed today.
+
+Leo: Okay, that matches my notes.