feat: define internal semantic workspace schema

backend/test/workspaces-migrate-legacy.test.ts

@@ -8,6 +8,7 @@ import {
   migrateLegacyWorkspace,
   writeMigratedWorkspace,
 } from "../src/workspaces/migrate-legacy.js";
+import * as workspaceSchema from "../src/workspaces/schema.js";
 import { parseWorkspaceYaml } from "../src/workspaces/schema.js";
 
 const temporaryRoots: string[] = [];
@@ -30,10 +31,15 @@ test("migrates the current local PSD descriptor without copying secret values",
 
 test("keeps an incomplete legacy vector identity readable and explicitly migration-required", () => {
   const result = migrateLegacyWorkspace(readFixture("tht.example.yaml"), { id: "example" });
+  const isOperationalWorkspace = (workspaceSchema as { isOperationalWorkspace?: unknown }).isOperationalWorkspace;
 
   expect(result.state).toBe("migration_required");
   expect(result.workspace.workspace.schema_version).toBe(1);
   expect(parseWorkspaceYaml(result.source).workspace.schema_version).toBe(1);
+  expect(isOperationalWorkspace).toBeTypeOf("function");
+  expect((isOperationalWorkspace as (workspace: ReturnType<typeof parseWorkspaceYaml>) => boolean)(
+    parseWorkspaceYaml(result.source),
+  )).toBe(false);
 });
 
 test("writes versioned repository artifacts atomically without replacing a prior migration", async () => {