implement CalDAV MCP server v1 with streamable HTTP tools

tests/ics.test.ts

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+import { describe, expect, it } from "vitest";
+import { ensureUid, validateIcsEvent } from "../src/ics.js";
+import { ValidationError } from "../src/errors.js";
+
+describe("ics helpers", () => {
+  it("adds UID when missing", () => {
+    const ics = `BEGIN:VCALENDAR\nBEGIN:VEVENT\nDTSTART:20260101T100000Z\nDTEND:20260101T110000Z\nEND:VEVENT\nEND:VCALENDAR`;
+    const output = ensureUid(ics);
+    expect(output.uid).toBeTruthy();
+    expect(output.ics).toContain(`UID:${output.uid}`);
+  });
+
+  it("rejects DTEND before DTSTART", () => {
+    const ics = `BEGIN:VCALENDAR\nBEGIN:VEVENT\nUID:abc\nDTSTART:20260102T100000Z\nDTEND:20260101T100000Z\nEND:VEVENT\nEND:VCALENDAR`;
+    expect(() => validateIcsEvent(ics)).toThrow(ValidationError);
+  });
+});