Add diagnosis eval harness

2026-07-04 23:51:43 +08:00
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+# Brief: diagnosis-eval-harness
+
+## Background
+
+The MVP has a runnable demo and hardened evidence trace semantics, but it still lacks a fixed regression baseline for Agent diagnosis quality. P1-B creates a small evaluation harness that can validate diagnosis traces against fixed cases and produce repeatable reports.
+
+## Goals
+
+1. Define fixed diagnosis cases for the MVP demo domain.
+2. Validate trace evidence, verifier verdicts, answer keywords, and degraded-output behavior.
+3. Produce JSON and Markdown reports for interview and regression use.
+4. Keep the first version offline by supporting trace fixtures.
+
+## Scope
+
+- Evaluation case definitions
+- Trace fixture shape
+- Rule-based evaluator
+- JSON / Markdown report output
+- Focused offline tests and docs
+
+## Non-Goals
+
+- No LLM-as-judge
+- No live end-to-end runtime requirement
+- No production API
+- No chat or verifier runtime change
+
+## Related OpenSpec
+
+`openspec/changes/diagnosis-eval-harness/`