feat(lanes): add pipeline-template picker to the Workspace lane header

Lets a lane's pipeline template be switched live from the dashboard
(the same PATCH /api/lanes/:id the CLI's `ccam lanes pipeline` uses),
so lanes created before the picker shipped don't need the terminal.
Both ship-feature skills now force their own template before their
first `ccam stage` call, so the human never has to pick correctly at
lane creation.

client/src/pages/__tests__/Run.defaultCwd.test.tsx

@@ -41,6 +41,10 @@ vi.mock("../../lib/api", async (importOriginal) => {
         send: r({ messageId: "m-1" }),
         kill: r({ ok: true }),
       },
+      lanes: {
+        list: r({ lanes: [], counts: { total: 0, running: 0, needs_you: 0, dead: 0 } }),
+        pipelines: r({ pipelines: [] }),
+      },
       ccConfig: {
         commands: r({ items: [] }),
         plugins: r({ plugins: [] }),