feat: rename bugfix-ship/requirement-flow to short-ship/long-ship with shared ship records

short-ship and long-ship share one ship-id record under .pouch/ship/<id>/.
specifier writes PRDs into spec/; delivery-loop appends evidence pointers.
Old names stay as deprecation stubs so existing installs keep working.

skills/delivery-loop/references/state-machine.md

@@ -47,3 +47,6 @@ ACK 配置必须使用以下 canonical `stopAt`：
 
 至少记录：基线和最终 commit、工作树状态、测试命令及结果、黑盒/真机证据、PR/MR URL、
 合并 commit、tag、产物路径与摘要、部署节点/服务、健康检查、失败项和回滚指针。
+
+已绑定 ship 记录时，上述证据以指针写入该 ship 的 `current.yaml`，不要另建一份账本。
+阶段与字段对应见 ship `references/record.md`。