补齐 AI 任务与历史清理的内存边界 (#206)

基于当前 master（含 #204）移植未进入 #203 的内存边界修复。

- 补齐外部生成历史清理 procedure 的 SATS tuple 解析与回归测试
- 限制 AI 流式文本每阶段 chunk 数量并分批释放明细
- 修正进程内失败收口的容量检查顺序
- 分批删除外部生成审计事件并同步更新契约文档

验证：
- cargo test -p module-ai -p spacetime-module
- cargo check -p api-server
- npm run test -- scripts/spacetime-migration-common.test.ts
- npm run check:spacetime-schema
- npm run check:production-ops
- npm run check:encoding
- git diff --check

Reviewed-on: http://192.168.35.82/git/GenarrativeAI/Genarrative/pulls/206
Co-authored-by: kdletters <kdletters@qq.com>
Co-committed-by: kdletters <kdletters@qq.com>

scripts/spacetime-migration-common.mjs

@@ -427,6 +427,24 @@ function normalizeSatsProduct(value, procedureName) {
     };
   }
 
+  if (
+    procedureName === 'prune_external_generation_job_history_and_return' &&
+    value.length === 10
+  ) {
+    return {
+      ok: normalizeSatsValue(value[0]),
+      dry_run: normalizeSatsValue(value[1]),
+      scanned_count: normalizeSatsValue(value[2]),
+      selected_count: normalizeSatsValue(value[3]),
+      deleted_job_count: normalizeSatsValue(value[4]),
+      deleted_summary_count: normalizeSatsValue(value[5]),
+      deleted_event_count: normalizeSatsValue(value[6]),
+      next_cursor_job_id: normalizeSatsOption(value[7]),
+      has_more: normalizeSatsValue(value[8]),
+      error_message: normalizeSatsOption(value[9]),
+    };
+  }
+
   if (value.length === 3) {
     return {
       ok: normalizeSatsValue(value[0]),

scripts/spacetime-migration-common.test.ts

@@ -223,4 +223,35 @@ describe('SpacetimeDB CLI SATS option encoding', () => {
     expect(objectResult.batch_sha256).toBe('d'.repeat(64));
     expect(objectResult).not.toHaveProperty('batch_sha_256');
   });
+
+  it('normalizes external generation history prune tuple results', () => {
+    const result = parseProcedureResult(
+      JSON.stringify([
+        true,
+        false,
+        25,
+        2,
+        2,
+        2,
+        10,
+        [0, 'job-25'],
+        true,
+        [0, '清理失败'],
+      ]),
+      'prune_external_generation_job_history_and_return',
+    );
+
+    expect(result).toEqual({
+      ok: true,
+      dry_run: false,
+      scanned_count: 25,
+      selected_count: 2,
+      deleted_job_count: 2,
+      deleted_summary_count: 2,
+      deleted_event_count: 10,
+      next_cursor_job_id: 'job-25',
+      has_more: true,
+      error_message: '清理失败',
+    });
+  });
 });