werk: Point empty-stash errors at the current ID reservation workflow

Change-Id: Ia97f456b18e23d260e3e912966d90cbd68119f8f

Author: SoloJacobs

packages/cmk-werks/cmk/werks/tool/cli/stash.py

@@ -30,9 +30,7 @@ def pick_id(self) -> "WerkId":
         try:
             return WerkId(sorted(self.ids)[0])
         except (KeyError, IndexError) as e:
-            raise RuntimeError(
-                "You have no Werk IDs. You can reserve 10 additional Werk IDs with 'werk ids 10'."
-            ) from e
+            raise RuntimeError("You have no Werk IDs in your stash.") from e
 
     def free_id(self, werk_id: "WerkId") -> None:
         """
@@ -77,7 +75,8 @@ def pick_id(self, *, project: str) -> "WerkId":
             return WerkId(sorted(self.ids_by_project[project])[0])
         except (KeyError, IndexError) as e:
             raise RuntimeError(
-                "You have no Werk IDs. You can reserve 10 additional Werk IDs with 'werk ids 10'."
+                "You have no Werk IDs. Please run 'werk init' to switch to the new reservation "
+                "mechanism, which reserves werk IDs on the fly during 'werk new'."
             ) from e
 
     def free_id(self, werk_id: "WerkId") -> None: