feat: turn session recording into a plugin (B13)

plugins/session-recording/tests/frontend/asciicast.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from "vitest";
+import { parseAsciicast } from "../../src/frontend/asciicast";
+
+describe("parseAsciicast", () => {
+  it("parses terminal dimensions and timed input/output", () => {
+    const recording = parseAsciicast(
+      '{"version":2,"width":120,"height":30}\n[0.1,"o","hello"]\n[1.5,"i","ls\\r"]\n[2,"r","100x40"]\n',
+    );
+    expect(recording.width).toBe(120);
+    expect(recording.height).toBe(30);
+    expect(recording.duration).toBe(2);
+    expect(recording.events).toHaveLength(3);
+  });
+
+  it("rejects unsupported recording versions", () => {
+    expect(() => parseAsciicast('{"version":1}\n')).toThrow(
+      "Unsupported asciicast version",
+    );
+  });
+});