fix: preserve workspace recovery contracts

packages/protocol/src/messages.ts

@@ -1494,14 +1494,7 @@ export const WorkspaceRecoveryStateSchema = z.discriminatedUnion("kind", [
   z.object({
     kind: z.literal("unavailable"),
     workspaceId: z.string(),
-    reason: z.enum([
-      "workspace_not_found",
-      "workspace_not_archived",
-      "project_not_found",
-      "project_directory_missing",
-      "workspace_directory_missing",
-      "worktree_branch_missing",
-    ]),
+    reason: z.string(),
     message: z.string(),
   }),
 ]);

packages/protocol/src/messages.workspace-recovery.test.ts

@@ -83,4 +83,28 @@ describe("workspace recovery protocol", () => {
       }).features?.workspaceRecovery,
     ).toBe(true);
   });
+
+  test("accepts unavailable reasons added by newer daemons", () => {
+    expect(
+      SessionOutboundMessageSchema.parse({
+        type: "workspace.recovery.inspect.response",
+        payload: {
+          requestId: "inspect-future",
+          state: {
+            kind: "unavailable",
+            workspaceId: "workspace-1",
+            reason: "future_recovery_constraint",
+            message: "This host cannot recover the workspace yet.",
+          },
+        },
+      }),
+    ).toMatchObject({
+      payload: {
+        state: {
+          kind: "unavailable",
+          reason: "future_recovery_constraint",
+        },
+      },
+    });
+  });
 });