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/ship/templates/status.template.md

@@ -0,0 +1,19 @@
+# <title>
+
+- ship id: `<ship-id>`
+- kind: `<kind>`
+- status: `<status>`
+- stopAt: `<stopAt>`
+- delivery: `<delivery.state>`
+
+## spec
+
+见 `spec.md`。
+
+## tasks
+
+见 `tasks.yaml`。
+
+## evidence
+
+测试、产物、部署、PR 和 commit 指针写在 `current.yaml` 的 `evidence`。