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/rules/index.ts

@@ -103,6 +103,23 @@ export {
   worldBits,
   type Placement,
 } from "./bits.ts";
+export {
+  diagnosisModel,
+  evaluateDiagnosisCombos,
+  selectDiagnosis,
+  settleDiagnosis,
+  type DiagnosisCombo,
+  type DiagnosisDecision,
+  type DiagnosisDirection,
+  type DiagnosisExplanation,
+  type DiagnosisModel,
+  type DiagnosisModelInput,
+  type DiagnosisParams,
+  type DiagnosisRuleInput,
+  type ExperimentOutcome,
+  type SettleDiagnosisInput,
+  type SkippedReason,
+} from "./diagnosis.ts";
 export { ablationCellLimit, forwardBatchSize, runBalance, type RunState } from "./budget.ts";
 export { authorVsMerged, trackRecord, type Phase, type Tally } from "./record.ts";
 export { assignEntries, type EntryAssignment } from "./entries.ts";
@@ -110,8 +127,11 @@ export { decisionSeed, seededRandom, seededSample } from "./random.ts";
 export {
   BATCH_RULES,
   CELL_RULES,
+  DIAGNOSIS_RULES,
   runBatchRule,
   runCellRule,
+  runDiagnosisRule,
   type BatchRuleName,
   type CellRuleName,
+  type DiagnosisRuleName,
 } from "./registry.ts";