implement CalDAV MCP server v1 with streamable HTTP tools

tests/xml.test.ts

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+import { describe, expect, it } from "vitest";
+import { parseMultiStatus } from "../src/caldav/xml.js";
+
+describe("parseMultiStatus", () => {
+  it("parses href and props from multistatus response", () => {
+    const xml = `<?xml version="1.0" encoding="UTF-8"?>
+<d:multistatus xmlns:d="DAV:" xmlns:c="urn:ietf:params:xml:ns:caldav">
+  <d:response>
+    <d:href>/SOGo/dav/user/Calendar/personal/</d:href>
+    <d:propstat>
+      <d:prop>
+        <d:displayname>Personal</d:displayname>
+      </d:prop>
+      <d:status>HTTP/1.1 200 OK</d:status>
+    </d:propstat>
+  </d:response>
+</d:multistatus>`;
+
+    const parsed = parseMultiStatus(xml);
+    expect(parsed).toHaveLength(1);
+    expect(parsed[0].href).toBe("/SOGo/dav/user/Calendar/personal/");
+    expect(parsed[0].statuses[0].status).toBe(200);
+    expect(parsed[0].statuses[0].props.displayname).toBe("Personal");
+  });
+});