Keep setup execution and output owned by the workspace (#7473)

* perf(workspaces): stop duplicating setup output in progress snapshots

Keep the required combined log field empty for setup clients, which display per-command output. Preserve concatenation only for legacy agent bootstrap timeline cards whose released renderers still read it directly.

* refactor(workspaces): own setup exclusively at the workspace boundary

Preserve keyed modern agent worktree creation while retiring legacy placement that selected an agent-owned setup lifecycle. Keep output in per-command workspace snapshots and retain empty strings required by existing wire schemas.

* fix(server): avoid duplicate cwd in worktree provisioning request

* test(e2e): keep developer toasts out of concurrent app assertions

Concurrent layout measurements could invoke the same Playwright locator handler before its first dismissal finished, leaving checks waiting for a removed button. Hide only the Expo toast host through test styling while retaining console error capture.

packages/protocol/src/messages.wire-compat.test.ts

@@ -474,3 +474,54 @@ test("usage entries accept older failures and additive successful snapshots", ()
     }).success,
   ).toBe(false);
 });
+
+// Frozen setup detail shape from v0.8.0: log is required, command output is optional.
+const ReleasedSetupDetailSchema = z.object({
+  type: z.literal("worktree_setup"),
+  worktreePath: z.string(),
+  branchName: z.string(),
+  log: z.string(),
+  commands: z.array(
+    z.object({
+      index: z.number().int().positive(),
+      command: z.string(),
+      cwd: z.string(),
+      log: z.string().optional().default(""),
+      status: z.enum(["running", "completed", "failed"]),
+      exitCode: z.number().nullable(),
+      durationMs: z.number().nonnegative().optional(),
+    }),
+  ),
+  truncated: z.boolean().optional(),
+});
+
+test("released setup clients parse empty combined logs and retain command output", () => {
+  const detail = {
+    type: "worktree_setup",
+    worktreePath: "/workspace",
+    branchName: "feature",
+    log: "",
+    commands: [
+      {
+        index: 1,
+        command: "echo ready",
+        cwd: "/workspace",
+        log: "ready\n",
+        status: "completed",
+        exitCode: 0,
+      },
+    ],
+  };
+  const parsed = ReleasedSetupDetailSchema.parse(JSON.parse(JSON.stringify(detail)));
+  expect(parsed).toEqual(detail);
+  expect(parsed.commands[0]?.log).toBe("ready\n");
+  const { log: _log, ...withoutLegacyField } = detail;
+  expect(ReleasedSetupDetailSchema.safeParse(withoutLegacyField).success).toBe(false);
+  expect(
+    WorkspaceSetupSnapshotSchema.parse({
+      status: "completed",
+      detail: { ...detail, log: "old daemon combined output" },
+      error: null,
+    }).detail.log,
+  ).toBe("old daemon combined output");
+});