feat: 诊断（任务书 18 第一块）：诊断数学、四种提交、一次运行跑多个实验、账本与材料、flow 诊断各步

消融默认关，关掉时解释阶段一并跳过；选诊断实验用信息价值减成本。
eval/diagnosis/research.json 为第三块配置。vocab 字段说明的出口文字随提示词一起改，见下一次提交的 prompts/ 与同文件改动（本次含在内）。

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/materials/index.ts

@@ -7,7 +7,7 @@ export { buildMaterial } from "./build.ts";
 export type { CodeChanges, PromptFile, Prompts, StudyFacts, TaskRequest } from "./inputs.ts";
 export { queryMaterial, readPrompts } from "./prompts.ts";
 // flow 推进时读账本也用这一份（本批基线、基线分数、留池候选、各候选合并了哪些原提案），不另写一份。
-export { Board, validScore } from "./read.ts";
+export { Board, validScore, type MergedExperiment } from "./read.ts";
 export {
   callId,
   candidateId,
@@ -17,6 +17,7 @@ export {
   clauseKey,
   critiqueId,
   DECISION_KINDS,
+  DIAGNOSIS_NOT_RUN, diagnosisExplanationId, diagnosisId, diagnosisKey, diagnosisNotRunEvent,
   entryId,
   experimenterId,
   verifierId,
@@ -33,6 +34,7 @@ export {
   type DecisionKind,
   type DecisionShapes,
   type DedupOutput,
+  type DiagnosisDedupOutput, type DiagnosisLocationTable, type DiagnosisSettlement,
   type FrozenProtocol,
   type LocationTable,
   type Settlement,