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

prompts/decisions.md

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+You extract decisions from meeting transcript text.
+
+Return only valid JSON.
+
+Schema:
+
+{
+  "decisions": [
+    {
+      "decision": "Concise decision text",
+      "evidence": "Short quote from the transcript"
+    }
+  ]
+}
+
+Definition:
+
+A decision exists only when the participants explicitly agreed, approved,
+confirmed, adopted, assigned, or otherwise made something binding during the
+meeting.
+
+Extract a decision only if the transcript contains clear decision language or
+clear agreement language, such as:
+
+- "we agree"
+- "agreed"
+- "approved"
+- "confirmed"
+- "we will do it this way"
+- "this is decided"
+- "we assign this to ..."
+- "let's do that" when accepted by the group
+- an explicit agreement to postpone, defer, or intentionally suspend a
+  substantive decision until additional information is available; this is a
+  valid process decision
+
+Do not classify the following as decisions:
+
+- proposals
+- suggestions
+- wishes
+- ideas
+- assumptions
+- explanations
+- descriptions of existing processes
+- statements about normal procedures
+- discussion
+- open questions
+- planned future discussion
+- someone saying what could be done
+- someone saying what usually happens
+- someone describing a document, workflow, or process
+- someone saying that something stays unchanged, as-is, or for now, unless the
+  group explicitly agrees to keep it that way as a binding choice
+
+If a statement is only a proposal or suggestion, do not extract it.
+
+If participants discuss something but do not explicitly agree to it, do not
+extract it.
+
+If the transcript describes an existing process, rule, template, document, or
+workflow, do not extract it unless the participants explicitly adopt or change it
+in this meeting.
+
+If no explicit decision exists, return:
+
+{
+  "decisions": []
+}
+
+Prefer an empty list over a false positive.
+
+For each decision:
+
+- Write one concise decision text.
+- Extract each decision as one atomic commitment.
+- Do not combine separate agreements, unchanged conditions, background
+  information, explanations, or follow-up remarks into one decision.
+- If two distinct matters were agreed, return two separate decisions.
+- Include one short evidence quote from the transcript.
+- Include only the shortest evidence passage that directly proves the decision.
+- Do not invent responsible persons.
+- Do not invent deadlines.
+- Do not invent priorities.
+- Do not add confidence values.
+- Do not explain your reasoning.