feat(issues): add issue documents and inline editing

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/__tests__/documents.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it } from "vitest";
+import { extractLegacyPlanBody } from "../services/documents.js";
+
+describe("extractLegacyPlanBody", () => {
+  it("returns null when no plan block exists", () => {
+    expect(extractLegacyPlanBody("hello world")).toBeNull();
+  });
+
+  it("extracts plan body from legacy issue descriptions", () => {
+    expect(
+      extractLegacyPlanBody(`
+intro
+
+<plan>
+
+# Plan
+
+- one
+- two
+
+</plan>
+      `),
+    ).toBe("# Plan\n\n- one\n- two");
+  });
+
+  it("ignores empty plan blocks", () => {
+    expect(extractLegacyPlanBody("<plan>   </plan>")).toBeNull();
+  });
+});