Unify the first runnable command across all primary restart entrypoints

Constraint: Limit this checkpoint to handoff and changelog documentation consistency
Rejected: Leave small formatting mismatches across entrypoints | Restart guidance should be byte-level easy to copy and compare
Confidence: high
Scope-risk: narrow
Directive: Keep the first verification command identical across AGENT, README, session handoff, and delivery handoff
Tested: Verified all four primary entrypoints contain the same runnable command block
Not-tested: No code or training path executed in this consistency-only checkpoint

+## 2026-06-02 delivery handoff 命令格式统一 checkpoint
+
+完成项：
+- 已把 `docs/delivery-handoff-2026-06-02.md` 中的最短可跑命令格式统一到与其他主入口一致。
+
+结论：
+- `AGENT.md` / `docs/README.md` / `docs/session-handoff.md` / `docs/delivery-handoff-2026-06-02.md` 现在都包含同一条格式一致的第一验证命令。
+
+## 2026-06-02 session handoff 补齐第一条可跑命令 checkpoint
+
+完成项：
+- 已把完整的最短可跑命令补入 `docs/session-handoff.md`。
+- 四个主入口现在都包含同一条第一验证命令。
+
+结论：
+- 新 session 即使先打开 `session-handoff.md`，也能直接执行第一条验证命令，而不必再跳转查找。
+
 ## 2026-06-02 delivery handoff 同步最短可跑命令 checkpoint
 
 完成项：

@@ -95,7 +95,8 @@ test -f /tmp/ab_smoke_seg_cap48_top2_seed999/report.json && cat /tmp/ab_smoke_se
 
 ```bash
 cd /workspace/acr-engine
-/usr/local/miniconda3/bin/python scripts/business_export_offline_smoke.py   --output-root /tmp/business_export_offline_smoke
+/usr/local/miniconda3/bin/python scripts/business_export_offline_smoke.py \
+  --output-root /tmp/business_export_offline_smoke
 ```
 
 预期：

@@ -259,6 +259,19 @@
 - `docs/README.md` 已新增“新 session 最短可跑命令”。
 - `AGENT.md` 已同步最短可跑命令。
 
+## 第一条可跑命令（重启后先验证）
+
+```bash
+cd /workspace/acr-engine
+/usr/local/miniconda3/bin/python scripts/business_export_offline_smoke.py \
+  --output-root /tmp/business_export_offline_smoke
+```
+
+预期：
+- 业务导出离线链跑通
+- 项目 `catalog/train/test/val` 成功生成
+- `train.py --dry-run` 通过
+
 ### 最优先待办
 1. 把已完成的 toy bucket baseline 升级为语义 bucket（风格 / 结构 / hard-case）。
    - 模板：`acr-engine/configs/buckets/fma_semantic_bucket_template.json`