import CodexBarCoreimport Foundationimport Testing struct AgentSessionJSONTests {    @Test    func `sessions json round trip preserves stable schema`() throws {        let session = AgentSession(            id: "fixture-session",            provider: .codex,            source: .ide,            state: .active,            pid: 42,            cwd: "/tmp/project",            projectName: "project",            sessionName: "Fix session labels",            startedAt: Date(timeIntervalSince1970: 100),            lastActivityAt: Date(timeIntervalSince1970: 200),            transcriptPath: "/tmp/rollout.jsonl",            host: "local-mac")        let encoder = JSONEncoder()        encoder.dateEncodingStrategy = .iso8601        let data = try encoder.encode([session])        let object = try #require(JSONSerialization.jsonObject(with: data) as? [[String: Any]])        let keys = try #require(object.first).keys        #expect(Set(keys) == [            "id", "provider", "source", "state", "pid", "cwd", "projectName", "sessionName", "startedAt",            "lastActivityAt", "transcriptPath", "host",        ])        let decoder = JSONDecoder()        decoder.dateDecodingStrategy = .iso8601        #expect(try decoder.decode([AgentSession].self, from: data) == [session])         var legacyObject = try #require(object.first)        legacyObject.removeValue(forKey: "sessionName")        let legacyData = try JSONSerialization.data(withJSONObject: [legacyObject])        let legacySession = try #require(decoder.decode([AgentSession].self, from: legacyData).first)        #expect(legacySession.sessionName == nil)        #expect(legacySession.id == session.id)    }}